Our Approach to Furnace Installation
When it is time for a new furnace, Aces Highlands helps you choose and install a high-efficiency system that delivers dependable heat and lower energy costs. Every installation includes proper sizing, clean ductwork connections, and thorough testing.
We install oil, propane, and natural gas furnaces from trusted brands. Modern high-efficiency furnaces can operate at 95% efficiency or higher, meaning more of your fuel dollar goes toward heating your home instead of going up the chimney. You might also want to consider a heat pump system for even greater efficiency and year-round comfort.
Proper sizing is critical for furnace performance. An oversized furnace short-cycles and creates temperature swings, while an undersized unit runs constantly without reaching comfortable temperatures. We perform a load calculation to determine the right size for your home.
Our furnace installations include removal of the old unit, new furnace installation, ductwork inspection and connection, thermostat setup, and a complete system test. Older homes may also benefit from an electrical panel upgrade to support the new system. We make sure everything is working perfectly before we leave.
How Do You Know It Is Time to Replace Your Furnace?
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.
Efficiency, Sizing, and What Installation Involves
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.
Local & Independent — Not a Franchise
Aces Highlands is a locally owned Portland, Maine company — not a national franchise. Our technicians are not commissioned salespeople and nobody here is required to upsell you anything. We do the work you called us for, do it right, and earn the next call. That is the whole business model.
More Furnace Repair & Installation Services
Furnace Installation FAQs
How much does a new furnace cost installed?
Most residential furnace replacements run roughly $5,000–$9,000 installed depending on fuel type, efficiency class, and ductwork condition. We provide a firm written quote before ordering equipment, and financing is available.
How long does furnace installation take?
A straightforward replacement is completed in one day, with heat restored the same evening. Jobs involving significant ductwork, venting changes, or fuel conversion may take a second day.
What size furnace does my home need?
The size should come from a heat-loss calculation of your actual home — insulation, windows, air sealing, square footage — not from copying the old unit’s label. Oversized furnaces short-cycle and create temperature swings; undersized ones run constantly and still fall behind.
Should I replace my furnace with a heat pump instead?
Worth considering. Cold-climate heat pumps heat efficiently through most of a Maine winter and add air conditioning, and Efficiency Maine rebates may apply. Many homes pair a heat pump with a furnace as backup. We install both, so we can price the options against each other honestly.
Do you remove the old furnace?
Yes — removal and disposal of the old unit is included in every installation, along with a full cleanup of the work area.
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Aces Highlands provides furnace installation across Greater Portland and Southern Maine. Find your community below.
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