Furnace Installation in Sanford, ME
A new furnace here will run from September through May every year. Tell us about the house, and a licensed contractor who covers York County will get in touch.
Tell us about the job
It takes about a minute.
Nine months of heat, and winter nights near 16 degrees
Your furnace has to work here from September through May. That's nine months of the year, and on winter nights that average 16°F, it runs long and often to keep the house warm.
Most homes in this area heat with fuel oil, and whatever fuel yours uses, a new furnace has to be sized for what these winters demand. If it burns gas, federal rules set the floor at 80 percent AFUE for furnaces built from November 2015 on, so any new install already starts there. Storms are part of the picture too. More than half of Maine households went at least 24 hours without power in 2024, so how a new furnace comes back on after the power drops matters as much as how it runs on an ordinary night.
- 9 months
- September through May, your furnace is on duty
- 16°F
- the average winter night it heats against
- 80% AFUE
- the federal minimum any new unit must meet
NOAA nClimDiv, 1991–2020 normals
- What size furnace does my house need?
- The right size comes from a load calculation, not the size of the furnace you have now. A contractor measures your square footage, your insulation, your windows, and your ceiling height, then works out how much heat your house loses on a cold night. With winter lows here averaging 16°F, a furnace that's undersized will run constantly and still fall behind, and one that's oversized will short cycle and wear out faster. Get a load calculation done for your specific house rather than going by rules of thumb.
- How do I know it's time to replace my furnace?
- If your furnace is struggling to keep up, cycling on and off more than it used to, or needing repairs every winter, it's time to start planning a replacement. Homes here need heat from September through May, nine months of the year, so a furnace that fails mid-winter leaves you without heat when it's coldest outside. Watch for uneven heating room to room, rising bills without a clear reason, or a burner flame that looks yellow instead of blue. A contractor can look at its age and condition and tell you honestly whether it's worth repairing again.
- Is a high-efficiency furnace worth it?
- It depends on how long you'll stay in the house and what furnace you're replacing. Any non-weatherized gas furnace made since November 2015 already has to reach at least 80 percent AFUE, so the real question is whether it makes sense to go higher than that baseline. Homes here need heat nine months a year, so a more efficient furnace has more months to make a difference than it would somewhere with a shorter winter. A contractor can walk you through the options and price out what fits your house.