Questions to Ask HVAC Technician When Installing New System

Did you know that more than half of all new HVAC system in the United States do not live up to their efficiency ratings? This is due to improper installations by HVAC contractors. In fact, a faulty installation can reduce performance by up to 30%!

questions to ask HVAC technician

These frequent installation mishaps not only raise your utility bills unnecessarily, but they also contribute to discomfort and a variety of indoor air problems, such as insufficient dehumidification, dust from leaking ductwork, and ventilation problems.

This is all to say that you should be very careful when shopping around for HVAC contractors. It may cost more upfront to have the installation done properly, but it is well worth it. A high-efficiency HVAC system means little if it is not installed according to ENERGY STAR Quality Installation Guidelines:

Questions to Ask HVAC Technician Before Installing New System


  • Do you offer ENERGY STAR qualified equipment?
  • Will you measure my home and calculate the correct size for my equipment using Manual J?¹
  • Will you install a properly matched indoor coil and outdoor unit?² (AC & heat pump only)
  • Will you test to determine the maximum system size that can be installed with my existing ductwork?
  • Will you install new refrigerant lines rather than reusing existing lines?
  • Will you install and help me to set up a programmable thermostat (if not already in use)?
  • Will you consider if zoning, with separate temperature controls for different areas, would be appropriate for my home?
  • Will you provide me with information on any local rebate programs for which I might be eligible?


  • Will you check for damage to existing ductwork and duct insulation, and make repairs if necessary?
  • If insulating ducts, will you seal all duct seams first?
  • Will you test to confirm that duct leakage does not exceed recommended levels?³


  • Will you show me how to replace the air filter(s) in my new system?
  • After installation, will you leave all manuals with me and provide documentation of installation procedures, including Manual J calculations, AHRI certificate, and records of any measurements or testing?
  • Do you offer third-party verification that my system was properly installed and set up?
  • Will you confirm proper levels of refrigerant and airflow across the coil? (AC & heat pump only)

1. Proper equipment size is vital for maximizing efficiency and comfort. To size your new system, the contractor should calculate your home’s heating and cooling loads using the Air Conditioning Contractors of America (ACCA) Manual J or equivalent.

2. Your contractor should provide an Air Conditioning, Heating and Refrigeration Institute (AHRI) certificate to document that your system was properly matched.

3. Duct sealing is essential to the operation of your heating and cooling system. In most cases, it is recommended that total duct leakage be no more than 20%.

Replacing your HVAC system is not as simple as swapping out your old equipment for a new one. Any HVAC contractor that gives you a quote before conducting a thorough inspection of your existing system, ductwork, insulation and ventilation, simply is not doing it right.

For more tip tips and tricks for saving money and energy, read our other blog posts:

Call Larry & Sons for professional HVAC replacements done according to ENERGY STAR’s Quality Installation Guidelines.

Whether you need a home zoning solution, are interested in sustainable energy solutions like geothermal, or are simply looking for a new high-efficiency air conditioner, look no further.

We’re happy to answer all of your questions! Just give us a call today at (301) 733-5428.

We stand behind our 100% Satisfaction Guarantee and are committed to providing top quality HVAC installation services in Hagerstown, Frederick MD, and the surrounding areas.

We service Hagerstown, Frederick, and the surrounding Maryland areas. We also service parts of West Virginia and Pennsylvania.

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Air Conditioning Myths Debunked

You’re more than likely familiar with the phrase, “Well if it’s on the Internet it must be true.” This is often a sarcastic remark in response to outrageous claims, and unfortunately, when it comes to saving money, we’ll believe just about anything we read.

Air Conditioning Myths Debunked

Air Conditioning Myths

Some of the tips and tricks you hear and read online can actually have negative effects, especially when it comes to expensive equipment like heating and air conditioning equipment.

We’ve debunked some of the most common air conditioning myths that claim to cut costs or provide more efficient comfort. Before we tell you the answers, can you guess which ones are myths and which one is true? No peeking!

1. Ceiling fans keep rooms cool.
2. Turning the thermostat way down will cool your home faster.
3. Annual tune-ups will extend the life of your air conditioner.
4. An air conditioner with a higher efficiency rating will by default save you energy.
5. Changing your air filters once a year should suffice.

Think you’re an A/C expert? See how well you did!

A/C Myths and Facts

1. Ceiling fans keep rooms cool

False: It’s often assumed that because we feel cooler in a room it must be because of the fan that’s on. However, the fan isn’t cooling the room; it’s cooling your skin! Sound confusing? The circulated air is moving across your skin, but that doesn’t mean it’s cooling the room.

Because a ceiling fan doesn’t cool a room, make sure to turn it off whenever you leave. A ceiling fan that is left on is only wasting your hard earned dollars. Nevertheless, running your ceiling fan only costs about 2 cents per hour, so don’t worry about it too much. Use your ceiling fan when you can to save on air conditioning costs.

2. Turning the thermostat way down will cool your home faster

False: Regardless of your temperature setting, your air conditioner always cools at the same rate. A cool, refreshing home sounds ideal after a long day at work, but setting the temperature way back won’t do any good, no matter the degree. If you want your home to be cool by the time you come home, we recommend setting your programmable thermostat to turn on 30 minutes before you arrive home.

Most air conditioners operate on a set speed, however, some units do offer low, high, and medium settings. If you aren’t satisfied with your current heating or cooling system, consider installing a programmable thermostat! You can set the desired temperature before you leave work so that when you arrive at home it’s cool and comfortable.

3. Annual tune-ups will extend the life of your air conditioner

True: Would you ever drive your car 50,000 miles without changing the oil or making sure it runs alright? Of course not! So why do that to your air conditioner? Much like a car, your AC system needs some good ole’ TLC once and a while. We recommend performing annual tune-ups on your AC so that you can be cool and comfortable all summer long.

As an added benefit, you can forget about all those frequent, costly air conditioner repairs! Our technicians can spot any problem before it becomes a messy and expensive affair. Annual tune-ups isn’t a service we implemented to get more money out of you; they’re designed to save you, the customer, from having to spend money on issues that could have been avoided in the first place.

4. An air conditioner with a higher efficiency rating will by default save you energy

False: We hope you didn’t feel too tricked by this statement, as it is partially true! They key to this is a perfectly executed installation. An installation that is rushed or not completed properly can cause the new unit to consume between 30 and 40 percent more fuel than it would if the installation had been completed with care and precision.

Larry & Sons employs only professional, highly trained technicians. We treat each and every service call with the care and respect it deserves.

5. Changing your air filters once a year should suffice

False: While changing your air filters is crucial, changing them only once a year is simply not good enough. Show your AC some love by changing the filters at least once every three months. A dirty filter slows down air flow, not to mention it makes way for poor indoor air quality.

Write the date on your air filter so when you go to look at it again you know when to change it

Now that we’ve cleared the air, we hope you no longer believe these AC myths! For all your home cooling needs, leave it to the experts at Larry & Sons. Got any questions? Well we’ve got the answer! Feel free to give us a call at (301)733-5428 and keep in touch with us on Facebook, Twitter, and Google+!