Furnace Installation in Portland & Southern Maine

Age is the first signal: most furnaces last 15–20 years, and past that point repairs start arriving in clusters. The other signs are rising fuel bills without a colder winter to blame, uneven heat between rooms, a burner that struggles to stay lit, visible rust or corrosion on the cabinet and flue, and — the one that ends the discussion — a cracked heat exchanger, which can leak carbon monoxide into your air stream and is rarely worth repairing on an older unit.

A useful rule of thumb: if a repair costs more than a third of replacement and the furnace is past 12–15 years, put the money toward new equipment. We show you both numbers and let you decide — our technicians are not commissioned, so the recommendation is not padded toward the bigger ticket.

Furnace efficiency is measured in AFUE — the percentage of fuel that becomes heat in your home instead of exhaust. Older units often run 70–80%; modern high-efficiency condensing furnaces reach 95%+, which means real savings on every fill-up or gas bill across a Maine winter. Whether the jump to condensing efficiency pays off in your house depends on fuel type and venting, and we price both classes side by side.

Installation day: we remove and dispose of the old unit, set the new furnace, connect and seal the plenum and ductwork, run venting and condensate (for condensing models), wire the thermostat, and commission the system with a combustion analysis. Most replacements finish in a single day, and heat is back on that evening. If ductwork is leaky or undersized, we tell you before the install, not after — duct problems can erase the efficiency you just paid for.