Electrical Phase

The vast majority of residential homes have single-phase electrical service. Many commercial and industrial buildings have triple- phase electrical service (usually in addition to single-phase service).

If you are purchasing a furnace or central air conditioner for your home, you will want to buy a single-phase unit: Installing triple-phase electrical service in your house can be expensive, and since residential furnaces and air conditioners tend to be single-phase, there is little incentive to upgrade.

HVAC Brands

Learn more about your home's heating and cooling system with our guides, how-to's, FAQ's, tips and more.


Trane American Standard Lennox Carrier Goodman

Ready to get a quote from an HVAC contractor?

Let us know what type of service you need and we can connect you with a certified local HVAC contractor.

Please enter a valid name

Please enter a valid phone number

Please enter a valid zip code

There are no dealers in this zip code.

Please enter a valid email address

Please select repair or replace

Please select heating, cooling or both