HVAC Contractor helping a couple choose a furnace

What size furnace do I need?

When you need to replace your outdated furnace, it’s important to realize one size does not fit all. A system that is not sized appropriately for your home, will not only impact your comfort, but can lead to shortened life of your furnace, and leave you with larger energy costs.

If you pick a unit oversized for your house, you’ll start to experience short cycles. The reason is that your oversized furnace heated your home too rapidly, turning off before the furnace can reach the right operating temperatures. An undersized or oversized system can lead to shortened lifespan and bigger expenses.

How can you be sure you know the correct furnace size for your home? Start with a load calculation from the team at Jett's Heating & Air Inc.. A load calculation takes aspects from your home into review and measures the Btu (a number that indicates the heating capacity of a furnace) required to heat your space.

Some Items that Influence Furnace Size

  • Square Footage—What size is the area your furnace will have to heat up? The technician will be sure to carefully measure the square footage of your home. Not every inch of your home may be accounted for during this process. Usually, it is more useful to account only for the space that needs heating.
  • Home Insulation—Insulation works to keep warm air from leaving your home through the cold winter months. It also heavily affects energy efficiency and how large of a heating system will be necessary. Let the experts from Jett's Heating & Air Inc. evaluate the insulation in your walls and attic. They’ll help you select the ideal furnace for your house.
  • Type of Window— Just like your walls, the particular type of windows in your home, frame type, glaze type, gas fills/spaces, etc. will influence your heating and cooling requirements.
  • Outdoor Climate—Think about the range of weather you experience in McHenry. You’ll want a furnace that can handle the conditions of your area every year, without overworking itself.

Don’t settle for ‘close enough’ when selecting your new furnace. Let the professionals at Jett's Heating & Air Inc. help you find a solution that will fit your home properly. When you’re ready to get started, contact us at 815-410-1128 or schedule an appointment online. Whether you have some questions about furnace size or want to discuss options for your space, our team is happy to help you out.

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