Sized to your home, set up for Denver's elevation, and installed with white-glove care. Free in-home estimates, financing available.
A furnace is a fifteen to twenty year decision, and the quality of the installation matters as much as the brand on the cabinet. Besties HVAC Solutions installs and replaces gas furnaces across the Denver metro for homeowners who want it done properly the first time: calculated sizing, correct altitude setup, clean venting, and a home left exactly as we found it.
Every estimate is free and every proposal is written, with clear options so you can choose the right balance of comfort, efficiency and budget.
Many Denver homes have furnaces that are far larger than they need, because the old unit was sized by square footage or simply copied. An oversized furnace short cycles, creates hot and cold swings, and wears out sooner. We perform a room-by-room heat load calculation (Manual J), look at your ductwork and static pressure, and size the new furnace to your actual home, including any insulation, window or remodel changes since the original install.
Gas furnaces lose capacity at altitude, and many manufacturers specify derating, commonly around 4 percent per 1,000 feet, with high-altitude kits or orifice changes on some models. Homes in Castle Rock, Castle Pines or the foothills sit even higher than central Denver. We follow the manufacturer's altitude instructions, then verify gas pressure, temperature rise and combustion on startup. This is the step most often skipped, and it is the one that protects the heat exchanger and your warranty.
80 percent AFUE furnaces vent through a traditional metal flue and cost less up front. 95 percent and higher AFUE condensing furnaces turn more of your gas into heat, vent through PVC, and produce condensate that must drain reliably. In a Colorado winter that drain and the outdoor vent terminations need to be routed so they do not freeze or get buried in snow. Two-stage and modulating furnaces with variable-speed blowers run longer at low output, which means quieter operation, fewer temperature swings and better filtration.
If you are replacing a furnace and an aging AC at the same time, consider a dual-fuel setup: a cold-climate heat pump handles most of the heating and all of the cooling, while the furnace covers the coldest nights. Qualifying heat pump installations may be eligible for combined Xcel Energy and Colorado incentives of up to $12,250 for qualifying households. Programs change, so we confirm current eligibility and prepare the paperwork. Learn more on our heat pump installation page.
Most furnace replacements are completed in one day, and complex jobs with duct or venting changes may take two. We protect floors and finishes, remove and haul away the old equipment, install the new furnace, update venting, gas connections and condensate drainage as needed, and handle the permit where your city requires one. Before we leave, we commission the system, walk you through the thermostat and filter, and register the warranty.
| Service | Typical range |
|---|---|
| 80% AFUE single-stage furnace, straightforward replacement | $5,500 to $7,500 |
| 95%+ AFUE two-stage furnace with variable-speed blower | $7,500 to $10,500 |
| Modulating premium furnace, zoning or communicating controls | $10,000 to $12,000+ |
| Furnace and central AC replaced together | $11,000 to $22,000+ |
Typical range, exact quote after free estimate. Venting changes, duct modifications, zoning and permits affect final price. Financing available on approved credit.
Want priority service and free diagnostics all year? See Comfort Club maintenance plans, or contact us with questions.
We measure, calculate and listen to how your home feels today, room by room.
Good, better and best proposals with real numbers, financing and any rebates you may qualify for.
A clean, careful install, tested against altitude specs and explained before we leave.
Send a few details and we'll get back to you the same day with honest, upfront pricing. Heat or AC down right now? Call or text, we're on it.
We received your request and will reply the same day. Need us now? Call (720) 610-1289.
Let Besties HVAC keep your home or property perfectly comfortable, all year long. Your estimate is free.
