Superior, CO Heating System Replacement Cost for 1,500–2,000 sq ft

Estimated Read Time: 9 minutes

Sticker shock is common when homeowners research the cost of furnace replacement. If you own a 1,500 to 2,000 sq ft home, the real cost of furnace replacement depends on sizing, efficiency, add‑ons, and install complexity. In this guide, we break down the cost of furnace replacement for Denver‑area homes, show where the money goes, and share smart ways to save without sacrificing comfort or safety.

What drives the price of a new furnace

For most 1,500 to 2,000 sq ft homes, total furnace replacement cost usually falls in a range, not a single number. Your final price is shaped by these factors:

1. System size and capacity
2. • A right‑sized furnace keeps you comfortable and efficient. Undersized units run constantly. Oversized units short‑cycle and wear out early.
   • Most homes in this size range land between roughly 60,000 and 100,000 BTU, but climate, insulation, windows, and ductwork all change the math. A Manual J load calculation is the gold standard.
2. Efficiency rating (AFUE)
3. • Standard efficiency: around 80% AFUE.
   • High efficiency: 95% to 98% AFUE. ENERGY STAR gas furnaces for northern climates are typically 95% AFUE or higher.
3. Installation complexity
4. • Venting changes for high‑efficiency units.
   • Gas line updates, condensate drains, electrical work, or code upgrades.
   • Tight crawlspaces or attics that increase labor time.
4. Ductwork condition
5. • Leaky, undersized, or dirty ducts lower comfort and raise bills. Repairs or redesign can be a great investment when replacing a furnace.
5. Add‑ons and IAQ options
6. • Smart thermostats, whole‑home humidifiers, HEPA or media filters, and UV lights all add cost and value.
6. Permits and inspections
7. • Reputable contractors pull permits and schedule inspections. It protects you, your warranty, and your resale value.
7. Local realities
8. • Denver’s altitude changes combustion. Many manufacturers require derating at high elevation. At roughly 5,000 ft, a typical gas furnace is often derated 10% to 15% per manufacturer instructions, which affects sizing and selection.

Typical price ranges for 1,500–2,000 sq ft homes in Denver

Every home is different, but these ballpark figures help you plan a realistic budget:

• Equipment only (furnace): about $2,000 to $5,000 for mid‑tier models. Premium, ultra‑efficient, or variable‑speed units can cost more.
• Standard replacement, installed: about $5,500 to $12,000 for many Denver‑area homes in this size range, including permit, labor, basic materials, and disposal.
• High‑efficiency replacement, installed: about $8,500 to $16,000 depending on brand, venting changes, condensate handling, and controls.
• Ductwork corrections: $1,000 to $4,000 for targeted repairs and balancing. Full redesign or new ducts can run $3,500 to $9,000+ depending on layout and access.
• Add‑ons:
• 1. Smart thermostat: $250 to $600 installed.
  2. Humidifier: $600 to $1,500 installed, model dependent.
  3. High‑grade filtration or UV: $350 to $1,200 installed.

These ranges reflect typical Denver Metro projects we complete in Denver, Aurora, Lakewood, Thornton, Arvada, Boulder, Westminster, Centennial, Lafayette, and Longmont.

How altitude, climate, and your home’s envelope change cost

• Front Range winters swing quickly. A calm 40°F afternoon can drop below 20°F overnight. Sizing must consider lows, wind, and exposure.
• Altitude derating means a nameplate furnace may deliver less heat at 5,000 ft than at sea level. That can push you to a different model or capacity.
• Older bungalows in Arvada or Lakewood may have smaller, restrictive ducts. Static pressure issues can demand duct modifications when you move to a high‑efficiency, variable‑speed system.
• Insulation and windows matter. Air sealing and attic insulation can allow a smaller, less expensive furnace to do the same job, cutting both upfront and long‑term energy costs.

Efficiency math: when a 95%+ AFUE furnace pays off

A higher‑efficiency furnace usually carries a higher price tag. Here’s how it can pencil out:

• Fuel savings: Upgrading from 80% to 95%+ AFUE reduces wasted heat. Over 10 to 15 years, many Denver homeowners see meaningful gas savings, especially in colder, wind‑exposed neighborhoods.
• Comfort: Modulating or two‑stage furnaces even out temperatures and often run quieter.
• Rebates and incentives: Utility and manufacturer rebates vary by season. High‑efficiency equipment typically qualifies first. We help you find and file current offers.
• Maintenance: Our deep‑clean approach keeps high‑efficiency systems running at peak performance. Regular maintenance can save up to 30% per year on energy costs and extend equipment life.

What’s included in a quality furnace replacement quote

Not all quotes are comparable. A thorough, apples‑to‑apples proposal should include:

1. Manual J load calculation and duct evaluation.
2. Clear equipment model numbers and efficiency ratings.
3. Scope of work: venting changes, gas line, electrical, condensate, and code upgrades.
4. Permit and inspection details.
5. Thermostat and control strategy.
6. Warranties: parts and labor terms spelled out.
7. Flat‑rate pricing with no hidden fees.
8. Optional add‑ons priced separately so you can prioritize.

We provide free estimates on new heating and cooling systems, flat‑rate pricing, and financing options through trusted partners, so you can plan without surprises.

Hidden costs to watch for (and how to avoid them)

• Skipped permits: Can void warranties and cause issues at resale.
• Mismatched venting: High‑efficiency units need proper PVC venting and condensate drains.
• Undersized return air: Starves the blower and shortens equipment life.
• Reusing a dirty, restrictive filter rack: Hurts airflow and efficiency.
• Incomplete commissioning: Your installer should measure static pressure, temperature rise, and combustion to verify performance at altitude.

Choose a licensed, insured company with NATE and EPA‑certified technicians. Our A+ BBB rating and thousands of 5‑star reviews reflect consistent, code‑compliant installs.

Furnace size for 1,500–2,000 sq ft: rules of thumb vs. real math

You might see rules of thumb like 30 to 60 BTU per sq ft, but that’s a rough guess. In Denver’s dry, high‑altitude climate, the right size depends on:

• Orientation and exposure to wind
• Insulation and air sealing
• Window type and area
• Duct design and static pressure
• Altitude derating requirements by the manufacturer

A Manual J load calculation plus duct assessment prevents oversizing and ensures comfort. We include both in our replacement process.

When to repair vs. replace

Consider replacement when two or more of these are true:

1. Your furnace is 15+ years old and needs a major repair.
2. Heat exchanger or control board issues make the repair cost exceed 30% of replacement.
3. Rooms are uneven, noisy, or dusty despite regular filter changes.
4. Energy bills keep rising without a weather event to explain it.
5. You have persistent safety issues, such as repeated flame rollout trips.

We offer 24/7 emergency service and a guaranteed 4‑hour service window to keep you safe and warm while you decide.

Add‑ons that improve comfort and health

• Smart thermostat: Optimizes schedules, can lower bills.
• Whole‑home humidifier: Denver’s dry winters cause static and dry airways. A humidifier restores comfort.
• High‑MERV or media filters: Capture more particles with less airflow penalty.
• UV lights: Help neutralize airborne microbes in the airstream.

Discuss these during your estimate so they are vented, wired, and warrantied correctly.

How we keep your furnace project on budget

• Free, no‑pressure estimates and transparent, flat‑rate proposals.
• Multiple system options at different efficiency levels.
• Financing available to spread out payments.
• Membership savings. Our Green Club is just $29.95 per month and includes routine maintenance, priority scheduling, and discounts on repairs and replacements. Members also receive a complimentary furnace deep clean valued at over $400.
• Hero Membership for qualifying community heroes offers free lifetime membership with bi‑annual heating and cooling maintenance and additional benefits.

Real Denver examples of cost drivers

• Lakewood mid‑century: Ducts were undersized for a variable‑speed upgrade. We added a larger return and trunk. Modest duct changes increased comfort and cut cycling, protecting the new furnace.
• Boulder foothills: Home faced frequent downslope winds. Load calc plus insulation upgrades allowed a smaller, quieter modulating furnace with better temperature stability.
• Thornton tri‑level: Condensing furnace needed new PVC venting and a condensate pump due to basement layout. Planning vent paths early avoided drywall changes and extra labor.

How to compare bids without getting burned

• Confirm permits and inspections are included.
• Match model numbers and AFUE ratings.
• Ask for the commissioning checklist and test results at handoff.
• Verify labor warranty length and what it covers.
• Read recent reviews that mention replacements or high‑efficiency installs.

As a final check, ask the estimator to walk you through total project time, crew size, and what to expect the day of install. Clear expectations prevent scope creep and surprise charges.

Maintenance matters: protect your investment

New or old, every furnace benefits from routine deep cleaning and tune‑ups. Our technicians perform safety checks, component testing, filter changes, and duct evaluations. Regular maintenance can save up to 30% per year on energy costs and reduce emergency breakdowns. Join the Green Club for priority service and ongoing savings.

Special Offers for Denver‑Area Homeowners

• Special Offer: $0 Service Call on Furnace Repairs. Mention “$0 Service Call” before 2025-12-31.
• Tune‑Up Deal: $39 Furnace Tune‑Up and Deep Clean. Book by 2025-12-31.
• Complimentary Deep Clean: Included with Green Club Membership at $29.95/month.
• Free Estimates: Get a free estimate on new heating and cooling systems.
• Hero Membership: Free lifetime membership with bi‑annual heating and cooling maintenance for qualifying community heroes.

Call (720) 577-4266 or visit https://fixmyhome.com/ to claim an offer. Financing available through trusted partners to fit most budgets.

What Homeowners Are Saying

"After several discounts I know we got a very good furnace at a reasonable cost. Christopher and Antonio came out the next day and replaced the furnace, repaired some ducts and explained everything about it and operating it. Dealing with this company was a pleasure, everyone was very nice and professional."
–Bob R., Furnace Replacement

"When our home heating system boiler started knocking and making loud noises, Fit-it 24/7 was able to get me a quick next day appointment during the coldest winter weather!... Keith was back the following day installing a new combi boiler system for our house and stayed the entire day until 6:00 pm installing it to perfection! I highly recommend Fix-it 24/7 Golden and their team!"
–Greg J., Golden

"I received the most thorough cleaning of my furnace I have ever experienced. Jose dismantled the entire insides of the furnace and after cleaning the parts looked brand new."
–Debbie D., Furnace Deep Clean

"We were provided with several options (by Josh) and our installation was done the very next day. The installer (Brandon) was very courteous, friendly and delivered a top notch install that was obviously thoughtful, professional and thorough."
–Ronnie S., Installation

Frequently Asked Questions

How much does a new furnace cost for a 1,500–2,000 sq ft home?

Most Denver‑area homes in this range invest about $5,500 to $12,000 installed for standard efficiency and $8,500 to $16,000 for high efficiency, depending on scope.

What furnace size do I need for my home?

Skip rules of thumb. A Manual J load calculation plus duct evaluation is the right way to size, especially at Denver’s altitude where derating applies.

Should I upgrade to 95%+ AFUE?

If you plan to stay in your home, 95%+ AFUE often pays back through lower gas bills, better comfort, and potential rebates. We will run the numbers for you.

Do you pull permits for furnace replacement?

Yes. We handle permits and inspections on every replacement. It protects your warranty and your home’s resale value.

Can I finance my furnace replacement?

Yes. We offer flexible financing options and free estimates so you can choose the right system without straining your budget.

The bottom line

The true cost of furnace replacement for 1,500 to 2,000 sq ft homes depends on sizing, efficiency, ductwork, and install complexity. In the Denver Metro, most projects land between $5,500 and $16,000 installed. Choose a certified team that pulls permits, commissions at altitude, and stands behind the work.

Ready to get a precise quote?

Call Fix-it 24/7 at (720) 577-4266 or schedule at https://fixmyhome.com/ for your free furnace replacement estimate in Denver, Aurora, Lakewood, and nearby. Ask about the $0 Service Call and $39 Tune‑Up offers before 2025-12-31.

Book your free estimate today: call (720) 577-4266 or visit https://fixmyhome.com/. Mention “$0 Service Call” for furnace repairs or grab the $39 Tune‑Up. Join the Green Club at $29.95/month for priority service and a complimentary deep clean.

About Fix-it 24/7 Plumbing, Heating, Air & Electric

Fix-it 24/7 serves the Denver Metro with certified, background‑checked techs and honest, flat‑rate pricing. We hold NATE and EPA certifications, maintain an A+ BBB rating, and stand behind our work with 24/7 emergency service and a 4‑hour service window. Homeowners choose us for deep‑clean tune‑ups, free estimates on new systems, and flexible financing options. Join our Green Club for maintenance and savings, or our free Hero Membership for qualifying community heroes.