How Long Does a Furnace Replacement Take?
Most furnace replacements take one day; venting, a chimney liner, gas line or duct work can add a second. Ours run $4,500–$9,500 installed. Call 612-429-3465.
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Furnace Replacement in Cologne, MN
Plan on $4,500–$9,500 installed to replace a furnace in Cologne, quoted flat-rate and in writing after a Manual J. In the original town's older houses, the shared chimney and water heater get their own line in that quote.
Furnace replacements in Cologne homes
Cologne's older houses and its newer subdivisions need different replacements. In the original town, a basement furnace venting into a chimney shared with the water heater is the norm. Moving to a 96–98% furnace takes the furnace off the chimney, adds PVC out a side wall and a condensate drain, and leaves the water heater needing a liner or a power-vent replacement. On small lots, the side-wall exit also has to clear windows, doors and the neighbor's house by the distances the manufacturer and code require, which can push the vent to the roof.
The homes built since the 2000s already have PVC and usually an air exchanger. Their builder furnaces may be oversized, so a Manual J often supports a smaller two-stage unit. On a Cologne replacement, the city's mechanical permit shows up as a line on the written quote.
Updated November 10, 2026
What affects the price of a new furnace in Cologne?
By efficiency: 80% AFUE roughly $4,500–$6,000; 96–98% AFUE roughly $6,500–$9,500. See the furnace replacement cost guide.
Furnace replacement in Cologne: questions
How do you route a 96% furnace vent on a small original-town lot in Cologne?
We start by measuring. The side-wall exit has to clear windows, doors, the gas meter and the neighbor's house by the distances the manufacturer and code require, and on a small lot that can be tight. If no side-wall route works, the vent can go through the roof. Sometimes an 80% furnace on a lined chimney is the practical fit, and we price it beside the condensing option. The chosen route goes in the written quote before work starts.
Our 2000s Cologne house still has its original furnace. Is it time to replace it?
Not automatically. A 20-year-old high-efficiency furnace with a sound heat exchanger and no recurring faults can keep going. Plan the replacement rather than waiting for January: get a written quote, have the condensate and vent parts checked at the next tune-up, and watch for repeated pressure-switch or ignition lockouts. A cracked heat exchanger or a second major failure is when we'd recommend replacing it.
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Guides on furnace replacement
Lennox Furnaces Compared: Merit, Elite and Signature
Lennox Merit, Elite and Signature furnaces overlap more than the names suggest. Learn to decode a model number; our 96–98% AFUE installs run $6,500–$9,500.
Read the guide96% vs 98% AFUE Furnace: Worth the Upgrade in Minnesota?
A 98% AFUE furnace saves only about 2% more gas than a 96% model. Our condensing furnaces run $6,500–$9,500 installed. See what the extra buys.
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