Picking an HVAC contractor is an important decision that shouldn’t be made without doing some research to make sure you’re making the best choice.

First, find a contractor who will ask you about your wants and needs and more important, listen to you. With that tidbit, they should be able to show you up to four options from which you can choose.

When they arrange your installation, is it when you want it done, or when they can fit you in? Will your contractor pull a permit on every job? Doing so will make certain that it meets all of your local codes.

HVAC system installation is not a do-it-yourself affair and a successful installation requires a contractor that is skilled in a variety of areas, from load calculation to piping and a bunch of steps in between. You could get the best system, but if it’s installed incorrectly you may not get top-of-the-line performance.

Here are a few other questions to help you make the best decision while researching your HVAC contractor.

Do they have NATE-Certification?

NATE (North American Technician Excellence) is the largest nonprofit certification organization for HVAC technicians. Certified technicians have demonstrated their knowledge in the HVAC industry by passing real-world and thorough tests developed by a committee of industry professionals. NATE-certified contractors have met the highest industry standards for knowledgeable installation and service. NATE certification will offer you peace of mind knowing your contractor has completed intense professional training.

Can they provide references or referrals?

A professional HVAC company should be able to provide you with a list of recent customers that you can chat with and confirm the quality of their company’s work. Talk to their list of references and ask about their project and if they’d recommend them to you.

There are also official sources online such as the Better Business Bureau and ACCA (Air Conditioning Contractors of America). The BBB allows you to read the consumer ratings of an HVAC contractor and you’ll be shown any customer complaints against a company. The ACCA is a nonprofit organization of more than 60,000 professionals and 4,000 businesses. Contractors found on ACCA are sure to be serious about their profession and will be able to give referrals for previous work.

Another route is crowdsourcing referrals from your friends and neighbors or on your social media networks. These are normally the most useful recommendations because they are coming from people you know. You’ll find out who to talk to and which contractors to avoid. If you’re on nextdoor.com you can literally ask for recommendations from people right next doo