Heating and Cooling Frequently Asked Questions (2023)

Our customers rely on JonLe technicians to answer their questions about the heating and cooling system in the Cincinnati home or office. Some of the most frequently asked questions are organized below by category. If you do not see your question here, or would like to talk to us directly, please call us at (513) 662-2282 or use the form on the left to contact us directly by email.

  • Energy Savings
  • Service
  • Indoor Air Quality
  • Thermostats
  • Installation
  • Air Conditioners
  • Heat Pumps
  • Heating

Energy Savings

  • How can we determine if our HVAC system seems to be running too much?

    Most systems should run about 2-3 cycles per hour.

  • How long should the furnace or AC run in a given cycle?

    Typically 10-15 minutes in mild weather. The closer you get to the max design temperature in heating (0 Degrees) or cooling (90 Degrees) the longer the run cycle will be.

  • Is there a recommended temperature range in our home that can yield the best overall energy savings?

    The cooler you set it in heating and the warmer in cooling the less energy you will use. Each person has their own temperature comfort range and we tell customers to find their optimum comfortable temperature and leave the thermostat set there for the occupied periods of the day.

  • Should I close the registers or ducts for areas of my home that I do not use on a regular basis?

    You can close some vents in unused areas of the home but be aware that your insulation is the exterior walls, if you let the room get too warm or cool you will still need to overcome that in the adjoining rooms. Closing off too many vents may also cause issues with the furnace or air conditioner.

    (Video) Top 20 HVAC Interview Questions and Answers for 2023

  • Who are these people who keep pestering me about switching from Duke to some other gas provider?

    They are alternate fuel providers that may be able to save you money on the Natural Gas you use to heat your home. They sell you the NG at a fixed rate over the year. Duke sells you the NG at different prices thru the year based on their actual cost at the time of delivery.

  • Will smart devices such as Nest help me save on my energy bill?

    Programmable thermostats can save you money if you use them properly. Typically with a gas furnace if you program in a setback of 5 degrees when you are at work and while you are sleeping you will use less energy in the month. With a Heat Pump you would need a special thermostat that would not bring on the electric backup heat when coming out of setback or you would use what you just saved to get the house back to temperature. In summer, avoid increasing the temperature for work and sleep times during extreme weather because the AC will take a long time to get back to your ideal comfort conditions.



  • How often should I schedule heating and cooling service for my HVAC system?

    We recommend having your heating & cooling system serviced twice in the year to keep it working at maximum efficiency, to find and fix small problems before they become major issues, and to avoid needing service during extreme weather conditions when everyone needs help and the wait for service can be longer than normal.

  • My gas bill has been getting bigger every year for the last few winters. Is there anything I can do to cut back on my HVAC System's energy usage? I keep my thermostat about as low as I can.

    A lot of people are in the same boat as you because natural gas prices, especially in the Midwest, have soared in the last few years. One way we've helped customers cope is with Trane's Hybrid Heat system. It's a high-efficiency natural gas furnace combined with a high-efficiency electric heat pump. It's often referred to as a "dual fuel" system.

  • What maintenance can or should I do myself on my furnace or air conditioner?

    Check your air filter on a monthly basis and change it whenever it’s dirty. Flush your condensate drain line when you check your filter, especially in the summer months when algae growth is more prevalent.

  • What should I check or make note of prior to calling for HVAC service?

    Check for a dirty filter, is the power switch on, is the circuit breaker tripped, is the thermostat set to heat or cool and the proper temperature?


(Video) Heating & Cooling Questions and Answers

Indoor Air Quality

  • Could my allergies be getting worse from not changing my HVAC filter?

    Yes, as your filter gets too dirty its ability to capture and hold particles decreases and more dust and dirt can come through the filter. It’s important to use a good quality filter, typically in the 8-12 MERV range. Below MERV 8 it does not capture enough particles and above MERV 12 it is too restrictive to air flow.



  • How much can a programmable thermostat save us vs. the cost of installation?

    If you use a 5 degree setback you can save between 5-10% on your annual cost to run the furnace. The cost to install a programmable varies greatly depending on what you purchase. It may take between 5-10 years or more to get a full payback.

  • Will smart devices such as Nest help me save on my energy bill?

    Programmable thermostats can save you money if you use them properly. Typically with a gas furnace if you program in a setback of 5 degrees when you are at work and while you are sleeping you will use less energy in the month. With a Heat Pump you would need a special thermostat that would not bring on the electric backup heat when coming out of setback or you would use what you just saved to get the house back to temperature. In summer, avoid increasing the temperature for work and sleep times during extreme weather because the AC will take a long time to get back to your ideal comfort conditions.



  • How is efficiency rating measured and should I always buy the best efficiency rating?

    Gas or Oil Furnaces are rated in AFUE (Annual Fuel Utilization Efficiency), Heat Pumps in HPSF (Heating Season Performance Factor) and Air Conditioners in SEER (Seasonal Energy Efficiency Rating). With gas furnaces you should buy a model with a 92% rating if you run the blower continuously for better air filtration as it has a more efficient blower. However, if you allow the air to turn off when not heating, a 95% model will save you energy in the long run. On the A/C side it has more to do with comfort as you get to the higher SEER ratings in our climate. The base A/C is a 13 SEER for each point you go higher it uses about 10% less energy to run.

    (Video) Frequently Asked Questions about Geothermal Heating and Cooling

  • How many years should I expect to get from a new furnace and air conditioning system?

    The life expectancy of most systems is 12-15 years.

  • Is a heating and cooling system with more capacity always better?

    Almost Never.The correct size of your HVAC system is based on running a computer generated load using measurements of your home’s interior space. If you put in an oversized furnace it will not run long enough to get to its steady sate efficiency. If you put in an oversized A/C unit it will not run long enough to remove humidity.

  • What size heating and cooling system should I have?

    The correct size of your system is based on running a computer generated load using measurements of your Cincinnati home’s interior space. If you put in an oversized furnace it will not run long enough to get to its steady sate efficiency. If you put in an oversized A/C unit it will not run long enough to remove humidity.


Air Conditioners

  • How do I know if our A/C unit is big enough for our home?

    The correct size based on running a computer generated load for your home. Typically in our market we size the A/C based on a 90 degree day. We expect the A/C to run most of the day on a 90 degree day to maintain 70 degrees inside.


Heat Pumps

  • How does a heat pump work?

    A heat pump pulls heat out of your home in the summer, just like an air conditioning system. In the winter, the heat pump captures heat from the outside air and transfers it to your home. (Yes, even cold air has heat energy in it.) A blower fan then pushes this heat through your ductwork and your vents.

    (Video) Heat Pump Frequently Asked Questions

  • I have an old gas furnace and central air conditioner. Should I consider replacing them with a heat pump?

    This is a possibility. Thanks to innovations in tecnology, such as the hyper-heating inverter,heat pumps can now keep a home toasty warm even if outdoor temperatures drop to 0ºF! That's a big improvement over the heat pumps of the past, which became ineffective when outdoor temperatures reached the freezing point (32ºF).

  • Why does the air from my vent feel cool when the heat pump is on?

    The HP is designed to heat the air about 20 degrees each time the air goes through the system. A gas or oil furnace is designed for a 40-70 degree temperature rise as the air passes thru the furnace. So if you maintain 70 degrees in the home, a heat pump will put out about 90 degree air depending on the outside temperature. Since the normal body temperature is 98.6 degrees this 90 degree air feels cool to us. In comparison a gas or oil furnace normally warms the air to between 110 - 140 degrees or higher and therefore it feels warm to us.



  • Do I need both a heat pump and a furnace?

    Yes, The Heat Pump is the outdoor condensing unit and it needs an air mover inside (electric, gas or oil furnace) to make it a complete system.

  • How can a heat pump work with a heating and cooling system to be more efficient?

    In mild weather the HP can provide all the necessary heat down to about 30-35 degrees, below that it would need some kind of backup heat source to provide the additional heat necessary to meet the load of the home down to 0 degrees.

  • How important is a humidifier, and why are they used more for heating than cooling?

    A humidifier is only used in the heating mode to add humidity to the home as the house dries out. Your body evaporates moisture off your skin when it is dry inside, so you feel warmer at a cooler temperature when the humidity is kept at a higher level. If the house gets too dry you will start to have more damage to your wood trim and furniture. Also when the humidity gets too low you can experience more adverse health issues. In the summer when the humidity level is high your air conditioner works to remove the excess humidity in your home.

  • What is the difference between a heat pump and a furnace?

    The Heat Pump takes the heat from the home and releases it outside in the summer to cool the home. In the winter it removes the heat in the outdoor air and releases it inside to warm the home. A furnace only produces heat by burning a fuel or using electric and also moves the air inside.


(Video) Top 10 Heating and A/C Questions | Rescue Air Heating and Cooling


What are the most common HVAC problems? ›

Get Answers to the 10 Most Common HVAC Problems

What factors affect the heating and cooling loads needed for a house? ›

Factors that affect how long it takes to cool your home
  • Heat and humidity outside. ...
  • Size of your home. ...
  • Orientation of your home. ...
  • Size of your air conditioner. ...
  • Heat sources inside your home. ...
  • Air leaks and insulation levels.

How long should a heating and cooling system last? ›

Remember, while the average HVAC system lifespan is anywhere between 10–25 years—based on your climate and what type of heating and cooling system you have. But your HVAC system may last less time than that if it has been overworked by insufficient insulation and unwanted airflow (due to unsealed air leaks).

What is the most sustainable heating and cooling system? ›

According to the Environmental Protection Agency, geothermal heat pumps are the number one most energy efficient, eco-friendly, and inexpensive heating and cooling systems in existence.

What are the 5 main procedures in HVAC? ›

You want to keep your HVAC system functioning for as long as possible.
Here are 5 maintenance steps you should be completed every three months to ensure HVAC system longevity.
  • Change Your Filters. ...
  • Check for Debris. ...
  • Clean Coils. ...
  • Clean Blowers. ...
  • Do Your Duct Research.
Mar 21, 2022

How can I improve my home heating and cooling efficiency? ›

Take these steps to increase the efficiency of your heating and cooling system.
  1. Change your air filter regularly. ...
  2. Tune up your HVAC equipment yearly. ...
  3. Install a smart thermostat. ...
  4. Seal your heating and cooling ducts. ...
  5. Consider installing ENERGY STAR certified heating and cooling equipment.

What are the five factors that affect HVAC comfort? ›

Top 5 Factors That Affect Your Home's Comfort & HVAC System
  • Temperature. The temperature of a home is often the first thing you notice when you walk in the door. ...
  • Air Quality. Poor air quality in your home can lead to allergies and illnesses. ...
  • Noise Level of your HVAC System. ...
  • Humidity. ...
  • Functionality.
Jan 4, 2022

What are the most common heating and cooling systems for homes? ›

Furnace & Air Conditioner

This traditional combination is the most common way to heat and cool a home in the US. It works by drawing in air from the interior, heating or cooling it, and distributing the conditioned air to each room via ductwork.

What is a common mistake in ductwork installation? ›

Duct Design Mistake #1: Undersized Ductwork

If your ducts are too small, they won't be able to deliver adequate heating and cooling for your home, no matter how powerful your furnace and air conditioner are. It takes a well-trained professional to determine the right size for your ductwork.

What is the average cost of a heating and cooling system? ›

According to Angi, the contractor-search site, the average cost of a new HVAC system nationally runs about $7,500 but can range anywhere from $5,000 to $12,000, reflecting the system's size, style and brand, along with your home's size and layout.

Should I replace my 20 year old HVAC? ›

Furnaces 20 years old or older become increasingly inefficient over time and can crack and leak, putting you and your family in danger. If your furnace is between 16 and 20 years old and constantly breaking down, then you should strongly consider having it replaced.

What is the most comfortable heating system? ›

Radiant heating system

This heating system provides the most comfortable and natural feeling heat of any heating system. Radiant heating systems come in a variety of forms, from pot-bellied stoves to in-floor hot water tubing to radiant ceiling panels, and transfer heat from a hot to a cold surface.

What is the least efficient heating system? ›

Oil: Oil furnaces run on oil to heat a home. These systems are the least energy-efficient, and oil delivery bills can run high during cold winter months.

What is the cheapest heat to run? ›

So, after looking at the different types of electric heaters available, due to its lower power-output, halogen heaters are the cheapest electric heaters to run.

What are the 3 R's in HVAC? ›

Safer refrigerants are now being phased in, but we are guided by “the Three Rs” established by the U.S. Environmental Protection Agency. They're Recovery, Recycle and Reclaim. Recovery pertains to opening an air condition unit for maintenance, service, repair, or even disposal.

What are the 3 components to a HVAC system? ›

  • Heating. The heating element usually consists of a furnace or boiler in most residential HVAC systems. ...
  • Ventilation. An HVAC's ventilation mechanism is responsible for moving heated or cooled air in and out of your home. ...
  • Air Conditioning. This part of an HVAC system is what cools down the air inside your home.

What is the most common circuit found in HVAC? ›

The most common commercial building electric service in North America is 120/208 volt wye, which is used to power 120 volt plug loads, lighting, and smaller HVAC systems. In larger facilities the voltage is 277/480 volt and used to power larger HVAC loads.

What causes HVAC to fail? ›

Dirty Condenser Coils

Soil, dust, leaves, and grass clippings that have collected on the condenser coils are a common source of AC decline and failure.

What are 6 major indicators that it is time to replace your HVAC system? ›

10 Signs It's Time To Replace Your HVAC System
  • Heating & Cooling System Unit Is 10 Years + Old. ...
  • Blowing Warm Air Or Not Blowing Cool Air. ...
  • Poor Or Weak Air Flow. ...
  • Loud Or Unusual Noises. ...
  • Humidity In The Home. ...
  • Foul Odors. ...
  • Leaks. ...
  • Frequent Or Short Cycling.

What should I set my AC at during heatwave? ›

Don't turn your system on and off – during a heatwave, it's better to run your AC / Heat Pump at 78 degrees while you out running errands or at work and let it maintain this temperature instead of turning it off while you are gone and then turning it back on again when the home interior exceeds 80+ degrees.

What is the most efficient thermostat setting for cooling? ›

To stay comfortable and save money this summer, the U.S. Department of Energy recommends setting your thermostat to 78F (26C) when you are home. Setting your air conditioner to this level will allow you to stay cool and avoid an unusually high electricity bill.

How do you keep heating and cooling prices down? ›

There are several free things you can do to help lower your bill.
  1. Bundle Up. ...
  2. Let the Sun Heat Things Up. ...
  3. Close off Unused Rooms. ...
  4. Cook or Bake at Home. ...
  5. Turn the Thermostat Down. ...
  6. Make Sure Doors and Windows Are Closed Tightly. ...
  7. Keep Heat From Escaping From Your Ducts. ...
  8. Use Ceiling Fans.

What rejects heat in HVAC? ›

A water condenser collects and carries heat away from the IT space and rejects it to the outside through the cooling tower. The cooling tower will reject heat from the IT room to the outdoor environment by applying warm condenser water onto top of the tower, allowing it to evaporate as it flows to the bottom.

What is the most common cause of HVAC failure during summer? ›

Inadequate Cooling

An AC unit that blows out warm air can be caused by many factors, including an improperly set thermostat, refrigerant leaks, frozen parts, blown breakers, and broken compressors.

What are the 4 most important factors in thermal comfort? ›

Factors affecting thermal comfort include air temperature, radiant temperature, relative humidity, and air velocity.

Which is more expensive heating or cooling? ›

Heating a home tends to cost more than twice as much as cooling a home.

What are the two types of HVAC systems? ›

Each type of HVAC system falls into one of two categories: ducted or ductless. In a ducted system, the main unit pushes air through a series of air ducts to cool or heat a building. Ductless systems, on the other hand, lack air ducts and use alternative methods to distribute treated air throughout a space.

What is the most expensive type of home heating? ›

Electric heat is the most expensive type of heating. To get cheaper heat using electricity you need to use a heat pump. The very cheap natural gas prices in the US mean gas heating is much cheaper, explaining its dominance for central heating.

What causes the most leaks in ductwork? ›

Temperature fluctuations, high humidity, and vibrations due to air circulation cause the wear and tear. Over time, the seals can deteriorate, the duct material can corrode, and the duct joints can disengage. Pests that find their way into the duct system can also cause damage.

What type of ductwork is best? ›

Flexible ductwork is the best type of ductwork to use in tight or awkward spaces where rigid ductwork would be too difficult to install. Because these air ducts are flexible, they can bend around fixed structures to work in almost any space.

Should HVAC vents be in ceiling or floor? ›

Ceiling vents do a better job cooling and floor vents do a better job heating. If your priority is cooling, put your HVAC in the attic and ducting and vents in the ceiling. If you prioritize heating, put the HVAC and vents in (or below) the floor. This principle works for return vents as well.

Will HVAC prices go down in 2023? ›

HVAC Pricing Increases Continue in 2023

Last year pressures were placed upon the consumer due to super-high inflation, as well as labor and supply shortages. The story has not changed much throughout 2022. We continue to see inflation reaching 7-8%, but it feels a lot worse than that for the consumer.

Is it cheaper to replace AC and furnace together? ›

Is It Cheaper to Replace a Furnace and AC Together? Simply put, yes. If you decide it's worthwhile for you to replace both the furnace and AC, you will save money replacing both at once. You will likely get a prorated price on the combined unit when you purchase it.

How hard is it to replace ductwork? ›

Although replacing ductwork can be done as a DIY project, it is a delicate and extensive project that requires some prior knowledge of how the construction of HVAC systems works.

How often does Freon need to be replaced in an air conditioner? ›

Never. You shouldn't have to add refrigerant to a central air conditioner because it doesn't use up the refrigerant. The only reason you would ever need to recharge (that is, add refrigerant to) your A/C is if you have a leak.

Does age of HVAC affect appraisal? ›

An HVAC system is considered “old” if it's ten years or older. Appraisers will note if the system is more than 13 years old. If the potential buyers know they have to eventually replace the unit, especially within a few years, they're likely to come back with a much lower offer.

What happens if you dont change HVAC? ›

The long-term effect of not changing your HVAC filter is the eventual breakdown of your unit. However, before that happens, your system will get clogged by dirt and dust from outside. A dirty air conditioning unit is inefficient because it uses a lot of power and energy to run.

What is the newest technology for heating homes? ›

Heat pumps are the newest home heating system technology. They use a system similar to an air conditioner by extracting heat from the air and delivering it to the home through an indoor air handler. A popular heat pump system is known as the mini-split or ductless heating system.

What temperature should I set my thermostat in the winter? ›

The ideal thermostat temperature in the winter is 68 degrees Fahrenheit when you're at home. Energy.gov suggests that 68 degrees is a good room temperature while you're awake at home but recommends lowering it while you're asleep or away.

What is the safest heat for a home? ›

#1: Electric Heat

Electric furnaces, baseboard heaters, and other heating methods that use electricity are among the most efficient and safe heating methods.

What is the cheapest heat source for a house? ›

Natural gas is likely to prove the cheapest way to heat a home if you have this heating option available to you where you live. Although prices have risen, natural gas is the least costly form of space heating. This is followed by electricity, propane, and heating oil, from the next cheapest to the most expensive.

What is the greenest way to heat your home? ›

6 eco heating options
  1. Heat pumps. A heat pump is basically the same as a fridge in reverse. ...
  2. Heat batteries. ...
  3. High-heat retention storage heaters. ...
  4. Electric radiators. ...
  5. Infrared heaters. ...
  6. Biomass boilers and stoves.
Oct 11, 2018

How do you know when your HVAC is going bad? ›

If you notice your air conditioner making a squealing, grinding, or grating noise, it may be time for a unit replacement. Strange sounds indicate something wrong inside the unit itself, and failing to contact a technician for repairs could result in costlier service on down the road.

How do I troubleshoot my HVAC? ›

9 HVAC Troubleshooting Tips
  1. Make Sure Your HVAC System Gas Power. ...
  2. Try Resetting Your HVAC System. ...
  3. Make Sure Your Furnace Door is Closed. ...
  4. Check the Thermostat for Issues. ...
  5. Install a New Filter in Your Furnace or AC. ...
  6. Check all Vents for Obstructions. ...
  7. Turn off the AC. ...
  8. Check Furnace and AC Wires.
Mar 26, 2020

How do you know if something is wrong with your HVAC? ›

What to look for when your HVAC system starts to fail.
  • No cool air. Period. ...
  • Wacky thermostat. One second your thermometer reads 72-degrees, the next it reads 80-degrees. ...
  • Run Forest Run. ...
  • This room's hot – this room's cold. ...
  • Something doesn't smell right. ...
  • A decline in the quality of air.
Jun 1, 2021

What is a common electrical problem in HVAC? ›

Residential HVAC systems have different wiring systems, making problems more difficult to detect. Three common problems wires can encounter are fraying, corrosion and disconnection. These issues can occur when there's a disruption in the flow of electricity.

Can I replace my AC without replacing furnace? ›

If your existing furnace and your new air conditioner are compatible, you don't necessarily need to replace both systems. This is usually the case when you replace your air conditioner with a similar model. A new furnace could boost your system's efficiency.

How do I check my HVAC ducts? ›

Turn your HVAC system on and return to the areas where ductwork is accessible. Check the connections between each section of duct, placing your hand over the metal. If you feel air against your hand, the connection is loose and there is an air leak. A common place for leaks is the duct joints.

What causes HVAC to not heat? ›

Two of the most common reasons your home central heating isn't working are a dirty flame sensor and a dirty air filter. Clean the flame sensor with a steel wool pad and replace the air filter every 1-2 months. This will help prevent future problems.

Is there a reset button on my HVAC unit? ›

Most air conditioning units are equipped with a reset button. These buttons tend to be red and quite small. If you're having a tough time finding it, consult your owner's manual.

What should I look for when replacing HVAC? ›

What to Know Before Buying a New HVAC System
  • Heating Size, Capacity, and Type. One of the first things you should check is the heating and cooling capacity of your new HVAC system. ...
  • Cooling Size, Capacity, and Type. ...
  • Energy Efficiency. ...
  • Check Noise Levels. ...
  • Maintenance and Indoor Air Quality.
Oct 17, 2017

Does HVAC affect home value? ›

So how much does a new HVAC system add to the value of a house? Installing a new HVAC system could increase your home's value by as much as $2,500-$3,000 or approximately 5-10% of the total value of your home. The typical cost of installing a new heating and cooling system is about $10,000.

What are the three most common circuit problems? ›

The Three Most Common Electrical Issues
  • #1) You Have Circuit Breaker Problems.
  • #2) Your Electricity Surges, Sags, or Dips.
  • #3) Your Home Has Scarce or Dead Outlets.

Which breaker is HVAC? ›

To check if this is the case, locate the A/C circuit breaker on your circuit breaker panel; it's the main power distribution panel that can be located inside or outside of your house. It's usually marked as “A/C,” “HVAC,” or “air-conditioner”.


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