HVAC True or False Questions to Help You Think

Remember when the teacher gave you an exam in school? The exam might have a true/false section, a multiple choice section or just consist of an essay question. Here are some true/false questions related to HVAC that will test your knowledge and upgrade it at the same time!

Directions: Please answer true or false for each question below. Each question is valued at 5 pts. For your convenience, the answers are stated below. (NOTE: Please do not move ahead and look at the answers before you give the answer a valid attempt.) The honor system is in play here.

  1. The temperature was hot the other day. I went to the thermostat and turned it down 5 degrees. My thermostat cooled down my house more quickly.
  2. I have two rooms in my home that are not used very often. I closed the registers and vents in those rooms. That should save me money on my energy bill.
  3. It is the middle of winter now so I opened a window for a short while. I think this is a good idea because it increases the indoor air quality.
  4. Installing more AC tonnage that is required will make my system more efficient and get the job done quicker. This will save me money.
  5. I have two dogs, a cat and a bird in my house. It is a good idea to change my air filter more often than usual.
  6. My cousin told me I should schedule HVAC maintenance one time per year. I’m gonna go with that.
  7. I am not going to install ceiling fans in my home because they don’t really help you save on heating and cooling. Besides, I have a very efficient HVAC system.
  8. Once an HVAC system is installed in a home, you will never have to purchase another one.
  9. The abbreviation HVAC stands for High Volume Air Conditioning.
  10. Relative humidity refers to the amount of moisture in the air relative to the maximum amount possible before the air becomes saturated.
  11. Lower humidity levels can cause dry skin, asthma, allergies, and increased risk of bacterial infection.
  12. A zoned HVAC system is one that has obtained the proper zoning permits from the city.
  13. Programmable thermostats can lower your bills and allow you to control your home environment using wifi.
  14. There is a direct cause and effect relationship between the size of your HVAC system and how effectively it heats or cools your home.
  15. If the heat exchanger cracks or stops working, it can release carbon monoxide into the atmosphere.
  16. AFUE refers to the American Furnace Underwriters Enterprise.
  17. SEER stands for Southern Energy Efficiency Routes.
  18. I discovered ice on the condenser coil of my HVAC system. It’s ok to leave it alone. It’s going to melt anyway as soon as the outside temperature increases.
  19. I heard that leaving the grass clippings, limbs, and debris that end up inside my outdoor HVAC unit will protect it from the weather.
  20. When I get estimates for HVAC work, I always go with the cheapest price. I always get a good deal.



  1. False. Setting your thermostat at a lower temperature will eventually lower the temperature, but the system will not do it in a less amount of time than it would normally take. Doing this will actually cause the system to work harder and increase your energy expenditure.
  2. False. HVAC systems are closed systems based around a definite and precise air pressure. Closing vents and registers actually causes parts in your system to work harder and may produce leaks in your ductwork as pressures are too high for the seals.
  3. True. Opening windows is a good way to clean out stale air. Don’t overdo it though as heat will rise and escape quickly.
  4. False. HVAC systems are designed with specific factors in mind that are special to your situation. Exact Manual J load calculations should be carried out and sizing done in accordance with local code and manufacturer’s specifications.
  5. True. Pets bring in excessive germs and give off pet dander which is made up of dead skin cells. Air filters will become clogged and dirty faster if pets are indoors. These clogged filters will create a lower indoor air quality and decrease air flow. This, in turn may cause electrical and mechanical breakdowns.
  6. False. At a minimum, you should have a professional inspect and perform maintenance on your HVAC system two times per year. One time should be during the spring and the other during the fall.
  7. False. Ceiling fans will always increase the energy efficiency of an HVAC system. They keep warm and cool air circulating assisting the HVAC unit to bring the rooms to the called for temperature from the thermostat. Also, if you have a temporary repair issue with your HVAC system, the ceiling fans can at least keep the air moving to provide some degree of comfort.
  8. False. HVAC systems are made with mechanical parts, gears, pumps, belts, and electrical components that have warrantied life spans. Maintaining your HVAC system with regular inspections and maintenance can increase its lifespan. However, things built by humans usually have a finite amount of time for peak performance and operation.
  9. False. HVAC stands for Heating, Ventilation, and Air Conditioning
  10. True.
  11. True.
  12. False. An HVAC zoning system is one that uses dampers in the ductwork to redirect air to areas of the home. Zoning the duct work in this way allows for the creation of individual temperatures within the zoned network.
  13. True.
  14. True. The size of your HVAC system must be calculated based on the particular measurements and features of your install location. Larger sizing does not necessarily increase efficiency. Absolute and accurate sizing of tonnage must be applied in all situations.
  15. True.
  16. False. AFUE stands for annual fuel utilization efficiency. It is a measurement expressed as a percentage that defines the ratio of useful energy output to energy input.
  17. False. SEER refers to Seasonal Energy Efficiency Ratio. Cooling output is measured during a typical cooling season and this is divided by the energy input necessary to achieve that cooling during the same period of time. The higher the SEER, the more efficient the unit is.
  18. False. Ice on the outside condenser can indicate insufficient air flow, low refrigerant, leaks, and other mechanical issues. This should be remedied at once or other repair issues can develop.
  19. False. Grass clippings, dirt, and other debris can seriously disable the functioning of the coils, pump, and electrical components found in the outside unit. Keep this area clean for top performance.
  20. False. Just paying for the lowest price does not mean you are getting the best quality workmanship or product for your money. With high efficiency HVAC systems installed by certified technicians may mean you may pay more up front, but the savings will be significant over time.

When you have completed your test, double check your work and please hand it in to the teacher. Return to your seat and wait patiently for everyone to finish. You may leave when the bell rings.

Have a nice day!