Furnace Installation & Replacement in Glendale

In multifamily buildings, furnaces usually sit in a hallway closet or a small utility room, often next to the water heater. The replacement has to fit the same footprint, keep required clearances and get enough combustion air. Some units draw that air from the room through louvered doors; if a previous owner swapped those for solid doors, we'll point it out. Electric furnaces are also common in apartments, and there a heat pump is often the most practical upgrade.

A condo with neighbors above, below and on both sides loses far less heat than a detached house of the same size. That's why we run a Manual J instead of copying the old nameplate. Many original apartment furnaces are oversized for the space they serve, which causes short cycling and hot-cold swings. At 5,351 feet, any gas furnace also loses roughly 21% of its sea-level input, and the install includes the manufacturer's high-altitude orifices and pressure settings.

Colorado has required new gas furnaces to meet a 14 ng/J NOx limit, or the latest ENERGY STAR version, since January 1, 2026. In a closet installation, venting decides a lot. An ultra-low NOx 80% furnace can tie into the building's existing vent if it's sized correctly. A 97% condensing model needs PVC to the outside and a place to send condensate, which may not exist in an interior unit. We confirm the vent and drain path before recommending one. See our NOx rule guide for background.

Glendale is served by Xcel Energy for both gas and electricity; the city negotiated a new Xcel franchise in 2026, subject to voter approval. For electric-heat apartments, a ducted heat pump or a ductless mini split can replace both heating and cooling. Colorado's $1,000 air-source credit and Power Ahead Colorado's $1,500 cold-climate rebate can apply; check Xcel's current rebate amounts directly.