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Hiring an HVAC company can feel overwhelming.
Quotes can be expensive, and don’t get me started on how confusing the terminology can get. If your AC or heat is already broken, you may also have to make a decision fast.
The one thing you should always ask before you sign anything: “What happens if I am not happy with the system after it is installed?”
That might sound simple, but it’s one of the most important things to know before you put down hundreds or thousands of dollars on an HVAC repair or replacement. A new system is a major investment, and once it’s installed, you need to know what to do if it fails to cool properly, control humidity, fit your home or perform as you expected.
Scott Urquhart, an HVAC sales and customer experience expert, says homeowners should look for a company that offers a money-back guarantee.
“The most important advice I can give people shopping for HVAC systems is to make sure to go with a company that offers a money-back guarantee,” he says. “You get to run this system for a year, and if there’s anything you don’t like about it, the company has to make it right.”
Here’s why that question matters — and what else you should ask before hiring any HVAC company.
Why does a guarantee matter so much?
Buying an HVAC system is not like buying a small appliance you can take to the customer service desk with the receipt during Saturday errands and return. It is significant equipment attached to your home, and the installation matters as much as the product itself.
This is why a written guarantee is so important. If the system does not perform as promised, the company will come back and make it right.
“You need recourse as a consumer in the event that you’re not satisfied, because there are a lot of risks you’re taking as a consumer when you have somebody attach something to your house and put something in your house that you just do not know,” says Urquhart. “So you need to be covered in the event that there is some sort of problem.”
That guarantee can give you more confidence that the company stands behind its work, not just the equipment.
The cheapest quote is not always the best choice
Don’t always assume the lowest number on an HVAC quote is the safest choice.
A cheaper quote may not include the same level of installation, warranty, ductwork, electrical work or follow-up service.
According to American Residential Services (ARS), one of the nation’s largest providers of air conditioning, heating and plumbing services, two HVAC quotes for the same home can differ by thousands of dollars. It’s typically not because one contractor is overcharging. It could be because of equipment tier, installation complexity and efficiency rating.
Before choosing a quote, compare the following:
- The exact equipment included
- The system size and efficiency tier
- Whether ductwork is included
- Whether electrical work is included
- Labor and installation scope
- Warranty coverage
- Maintenance or follow-up service
- Any comfort or money-back guarantees
Installation quality can make or break the system
As mentioned above, the best HVAC equipment can fail to perform if it is not installed correctly.
“An HVAC system is not complete until it’s installed correctly,” Urquhart says. “Whether it’s the greatest equipment with the greatest warranty in the world, or it’s the cheapest equipment you’ve ever found or heard of, you have to install it correctly. And if you don’t, you’re going to have problems.”
A proper installation accounts for sizing, airflow, ductwork, wiring protection, thermostat setup and your home’s actual cooling and heating needs, amongst other factors.
Joey Dooley, a general manager at ARS in Texas, says the same thing applies to performance.
“I tell people all the time that the equipment can be great, but if the installation is bad, the performance will be bad.”
That is why the question of the guarantee matters. If the installation is not right, you want to know the company will fix it. Period.
Your system needs to be sized properly
Another question to ask your HVAC company is whether they will perform a heat-load calculation. A heat-load calculation helps determine what size HVAC system your home actually needs based on factors like square footage, insulation, windows, layout and cooling or heating needs. I
Many homeowners think a bigger system is better, especially if the current HVAC they have installed is failing to cool their home, but bigger is not automatically better.
“First of all, it needs to be sized properly,” says Gregory Milich, an HVAC expert and college instructor with 43 years of experience. “You can’t just take a three-ton system out and put a four-ton system in because the customer says, ‘I just want more air conditioning.’ It does not work that way.”
If the system is too small, it may run constantly and struggle to keep up. If it is too large, it may cool too quickly without removing enough humidity, leaving your home feeling damp or uncomfortable.
Josh Conder, division operations manager for ARS Central Division, says his team does a full heat-load calculation to determine what works best for the home. This is “as opposed to just throwing out a blanket price and hoping that it works,” Conder says.
Do not forget about ductwork
“A lot of the real problems come from ductwork,” Dooley says. “If the ducts are installed improperly, if there are restrictions, if things are sealed badly, then you’re not getting the efficiency you paid for. For example, we can change to higher-efficiency equipment, but if the airflow and duct system aren’t right, you’re not going to get that full efficiency.”
That means a new system can still underperform if the ducts are leaking, restricted, poorly sealed or not sized correctly.
According to ARS service data, ductwork repair or replacement typically runs between $2,800 and $4,000 per job, depending on the extent of the work and the home’s layout.
Always ask if the ductwork is included in the quote and whether the ducts were inspected before getting a quote.
What to ask before hiring an HVAC company
Before you sign a contract, ask direct questions and make sure you understand the answers.
| Question to Ask | Why It Matters |
|---|---|
| Do you offer a money-back or comfort guarantee? | Gives you recourse if the system does not perform as promised |
| What happens if I am not satisfied after installation? | Shows whether the company stands behind its work |
| Was a heat-load calculation performed? | Helps ensure the system is sized correctly |
| Is the system the correct size for my home? | Incorrect sizing can cause comfort and humidity problems |
| Were the ducts inspected, sealed or replaced? | Bad ductwork can reduce airflow and efficiency |
| Is electrical work included? | Electrical upgrades can affect the total cost |
| Are permits included? | Helps ensure the work meets code |
| What warranties apply? | Protects the equipment and possibly the labor |
| What maintenance is required? | Missed maintenance may affect warranty coverage |
| What is included in the quote? | Helps you compare bids accurately |
How much could an HVAC replacement cost?
Because HVAC replacements are quite expensive, it is worth asking every question before you commit.
According to ARS, a complete residential HVAC system replacement typically ranges from about $12,000 to $16,000, depending on system type, home size and installation requirements.
ARS notes that simpler furnace-only replacements typically cost less, while premium or high-efficiency systems and complex installs typically cost more.
A central AC split-system replacement typically ranges from $13,000 to $16,000, with the cost driven by system size, efficiency and installation complexity.
ARS also adds that a combined gas furnace and AC system typically runs between about $13,000 and $16,000, depending on equipment and home requirements.
These ranges are, of course, approximations, but they show why a guarantee, proper evaluation and detailed quote matter so much.
When repair may not be enough
If you’ve ever owned a house, you know that it’s easy for a simple repair call to quickly turn into an entire replacement with no notice. If that’s what your HVAC company is telling you to do, don’t just agree — ask why.
ARS recommends a general rule for homeowners: If a repair quote is more than half the cost of a new system and the unit is over 10 years old, replacement usually makes more financial sense over the life of the system.
“In some cases, an eight- or nine-year-old system makes sense to replace,” Dooley says. “In other cases, you may have a system that’s 15 years old that still makes sense to keep. We really want to do that analysis and let the homeowner know what the true cost of ownership has been so they can make a decision.”
The true cost of ownership includes repair costs, system age, efficiency, comfort, warranty coverage and how often the system breaks down.
If you only remember one thing, let it be this
The one question you must ask before hiring any HVAC company is simple: “What happens if I’m not happy with the system after it is installed?”
That answer tells you a lot, first and maybe most importantly, if the company offers a money-back guarantee or comfort guarantee that shows it stands behind the equipment, installation and final result.
But don’t stop there.
Ask about the sizing for your space, ductwork and airflow, as well as any warranties and maintenance and request a very detailed review of the quote.
An HVAC system is too expensive to buy on trust alone. Get the details in writing before you let anyone start the job.
FAQ
How often should HVAC maintenance be done?
Dooley says biannual maintenance is the baseline in many cases, and many manufacturers recommend it. Regular maintenance can help catch problems early and protect warranty coverage.
What does it mean if an HVAC quote is much cheaper than the others?
A much cheaper HVAC quote may not include the same equipment, ductwork, electrical work, permits or warranty coverage as a higher quote. Always compare what is actually included before assuming it is a better deal.
What should I do if the contractor cannot explain the quote clearly?
That is a red flag. An HVAC company should be able to explain what is included, what is not included, why the system is recommended and what happens if there is a problem after installation. If they can’t, don’t move forward with that company.
