Furnace Installation

Furnace installation cost varies based on the furnace selected, system capacity, installation complexity, and whether additional work is required — new gas line, ductwork modifications, updated venting. We evaluate your home and provide upfront pricing before any work begins. A professional assessment is the only accurate way to determine the cost for your specific situation.

Furnace replacement costs vary from home to home. The total depends on the furnace selected, required capacity, installation requirements, and whether modifications to the existing gas line, ductwork, or venting are needed. We provide a detailed quote after evaluating your existing system and home — not a ballpark number that bears no resemblance to the actual job.

A straightforward furnace replacement — same fuel type, same location, same venting configuration — typically takes 4–8 hours and is completed in a single day. More complex installations involving new ductwork, updated venting, different fuel types, or permit inspections may require additional time. We provide a realistic timeline after evaluating your specific installation.

Key indicators: the furnace is 15–20+ years old, you've had multiple repairs in recent years, it struggles to reach or maintain the thermostat setting, heating is uneven throughout the house, energy bills have been increasing, or a technician has identified a cracked heat exchanger. A professional inspection can determine whether repair or replacement makes more sense for your specific system.

The right answer depends on the furnace's age, condition, repair requirements, and cost. A useful rule of thumb: if repair cost exceeds 50% of the cost of a new system, and the furnace is over 10–12 years old, replacement often makes more financial sense. A cracked heat exchanger almost always means replacement. We give you an honest recommendation after evaluating your system — not a default push toward the more expensive option.

Furnace sizing should be based on a load calculation — not just square footage. Insulation, window area, ceiling height, air sealing quality, Colorado altitude, and home orientation all affect heating requirements. An oversized furnace short-cycles, causes temperature swings, and wears prematurely. An undersized furnace runs constantly and can't keep up during Colorado cold snaps. We size systems properly.

For most Colorado homes, a high-efficiency furnace (90%+ AFUE) makes economic sense given the length and severity of Colorado winters. The efficiency gain over a standard furnace (80% AFUE) means roughly 12.5% less gas burned for the same heat output — meaningful over a full heating season. High-efficiency furnaces also require a condensate drain and typically use PVC venting rather than metal flue pipe, which affects installation requirements.

Yes. We install natural gas furnaces throughout Colorado's Front Range — single-stage, two-stage, and variable-capacity systems in a range of efficiency ratings. Gas line work is permitted and pressure-tested. All installations meet Colorado mechanical and fuel-gas code requirements.

Yes. Electric furnaces are an option for homes without natural gas service. We can evaluate whether an electric furnace, a heat pump, or a dual-fuel system is the best fit for your home's heating requirements and utility costs.

Zenith Home Services serves 55+ communities throughout Colorado's Front Range — Denver, Aurora, Lakewood, Arvada, Westminster, Thornton, Boulder, Longmont, Fort Collins, Loveland, Greeley, Castle Rock, Parker, Centennial, Highlands Ranch, and Colorado Springs, among others. Visit zenithhomesservices.com/service-areas for the full list.

Yes. A furnace replacement doesn't have to be like-for-like. Some homeowners use a furnace replacement as an opportunity to switch from standard efficiency to high-efficiency, from oil to gas, or to add a heat pump as the primary system with the furnace as backup (dual-fuel). We discuss all available options before recommending an approach.

Fall — before the heating season — is the ideal time to replace an aging furnace. Scheduling ahead of the busy season means more flexibility on timing, and you start winter with a reliable new system. That said, if a furnace fails or becomes unreliable in the middle of winter, we don't wait for the ideal season — we get a replacement in as quickly as possible.