Furnace Installation & Replacement in Niwot

A single furnace serving a two-story house with a finished basement struggles to keep every level comfortable. A Manual J done room by room tells us the load on each floor, and the results often point to a modulating furnace with two or three zones, or a separate system upstairs, rather than more capacity. At 5,168 feet, a gas furnace delivers about 79% of its sea-level input after high-altitude conversion, which the load calculation accounts for. We design to the local climate, with January lows averaging about 22 degrees.

Boulder County Building Safety and Inspection Services issues the mechanical permit for a furnace replacement in Niwot. BuildSmart, the county's energy code program, kicks in when a project adds conditioned space or changes it, so a straight replacement is simpler than one that comes with a basement finish or an addition. If you're planning both, tell us early, because the energy requirements can affect what equipment and ductwork make sense. We file the permit and schedule the inspection.

Since January 1, 2026, gas furnaces sold in Colorado must meet 14 ng/J NOx or the newest ENERGY STAR version. An ultra-low NOx 80% furnace can stay on an existing metal vent or lined chimney, which can matter in a Niwot Village farmhouse. A 97% condensing furnace uses PVC and a condensate drain, and on a large house the gas savings are bigger, so the case for condensing is usually stronger. Our NOx rule guide has more.

A utility directory lists Xcel Energy for both gas and electricity in Niwot; check your bill. With Xcel electricity, a heat pump can qualify for Xcel rebates, which changed October 1, 2026, plus Colorado's $1,000 air-source credit and Power Ahead Colorado's $1,500 cold-climate rebate. Boulder County's Switch Together program has offered group pricing on heat pumps too. On a large home, a dual-fuel system that keeps a gas furnace for the coldest nights is often the practical choice.