How to choose a heating and cooling contractor (and what to ask)

A new furnace or AC is one of the bigger checks you’ll write for your house. Here’s how to find a heating and cooling company you can trust, before it’s 95 degrees out.

BuddyRow Guides · 3 min read · Updated October 2026

The short version

Ask friends who services their system and whether they’d call them again. Get to know a company on a routine tune-up before you need a big repair. For a replacement, get two or three written quotes with model numbers, and make sure the system is sized for your house.

Start with people you trust

Heating and cooling is full of judgment calls: repair or replace, which system, what size. You want a company that gives honest advice, not just the biggest ticket. Friends who’ve used a company for years are the best signal you can get.

Meet them on a tune-up first

Many homeowners schedule a furnace check in the fall and an air conditioning check in the spring. A routine visit is a low-stakes way to see how a company works: whether they show up on time, explain what they find, and avoid pushing extras.

If you ever smell gas, leave the house first, then call your gas company or 911 from outside. If you have gas appliances, keep working carbon monoxide detectors.

Repair or replace?

If someone recommends replacing your system, ask them to explain why a repair doesn’t make sense, and get a second opinion. For a replacement, a good contractor sizes the new system for your house, often with a load calculation (sometimes called a Manual J), instead of just matching the size of the old unit.

What to check before you hire

  1. A license where you liveHeating and cooling contractors are licensed by the state in some places and by the city or county in others. Your local building department can tell you what applies.
  2. InsuranceAsk for proof of liability insurance before anyone starts work in your home.
  3. EPA certificationFederal rules require technicians who work with refrigerant to hold EPA Section 608 certification. It’s fair to ask.
  4. A detailed written quoteFor a new system, the quote should list the equipment brand and model numbers, what’s included, and the total price.
  5. The warranty, in writingAsk what covers parts and what covers labor, how long each lasts, and whether the equipment has to be registered to get the full warranty.

Questions to ask a heating and cooling contractor

  • Are you licensed and insured here? Are your technicians EPA certified?
  • Is there a fee for the diagnostic visit?
  • Why repair, or why replace? What would you do if it were your house?
  • How will you size the new system? Will you do a load calculation?
  • Can you put the model numbers and efficiency ratings in the quote?
  • What warranty covers parts, and what covers labor? Who registers the equipment?
  • Will this need a permit, and will you pull it?

Red flags

  • They quote a replacement over the phone without seeing your house.
  • They size a new system only by the old one’s label.
  • They push “today only” pricing or pressure you to sign on the first visit.
  • They say a part is dangerous but won’t show you or put it in writing.
  • They won’t list model numbers in the quote.

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Common questions

How do I choose a good HVAC contractor?

Ask friends who they’ve used for years and would call again. Confirm the company is licensed where you live and insured, that technicians are EPA certified, and that quotes are in writing with model numbers.

How often should I have my furnace and AC serviced?

Many homeowners have each system checked once a year, the furnace in the fall and the AC in the spring. Your system’s manual and warranty terms may have specific requirements.

Should I repair or replace my system?

It depends on the system’s age, how often it has needed repairs, and what the repair costs. Ask the contractor to explain their reasoning, and get a second opinion before replacing.

How many quotes should I get for a new system?

Two or three written quotes is a good rule. Compare the equipment, sizing, warranty and what’s included, not just the price.

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