Back to blogs

November 3, 2025

Littleton, CO Heating System Replacement Costs — HVAC Guide

Estimated Read Time: 11 minutes

If you are researching furnace replacement cost, you are not alone. When heat is unreliable, every hour feels longer, and surprise quotes add stress. This guide breaks down real cost drivers, how to budget, and when repair still makes sense. You will learn exactly what to expect in the Denver area, how to avoid surprise add-ons, and how to save without cutting corners.

What does a new furnace really cost?

Furnace replacement pricing varies by equipment type, efficiency, home size, and installation conditions. In the Denver metro, most full replacements land in a wide band because of altitude, code, and duct factors. The key is knowing what is included. A trustworthy quote should itemize equipment, labor, permits, accessories, and any duct or vent changes.

Typical price drivers:

  1. Equipment size and efficiency rating
  2. Fuel type and venting path
  3. Duct and gas line condition
  4. Thermostat and indoor air quality add-ons
  5. Altitude adjustments and code compliance
  6. Warranty and installer qualifications

A complete proposal should include removal of the old unit, startup and commissioning, and manufacturer registration. Transparent, flat-rate pricing protects you from open-ended time and materials bills.

The big factors that move furnace price up or down

A replacement is not just a box swap. Your total cost is shaped by several technical details:

  1. Sizing and load requirements
    • Larger homes require higher BTU output, which costs more.
    • Oversizing causes short cycling and comfort issues; right-sizing saves money.
  2. Efficiency level (AFUE)
    • Standard efficiency uses existing metal venting if compatible.
    • High efficiency adds PVC venting and a condensate drain, which increases labor.
  3. Fuel and venting
    • Natural gas is common in the Front Range. Propane and electric options change operating costs and hardware.
    • Concentric or two-pipe PVC venting may require new wall or roof penetrations.
  4. Ductwork and airflow
    • Leaks, undersized returns, or restricted ducts reduce performance and can void warranties.
    • Small fixes like adding a return drop or sealing ducts often pay back in comfort.
  5. Thermostat and controls
    • Smart thermostats add comfort and efficiency but need correct wiring and setup.
  6. Accessories
    • Humidifiers, media filters, UV lights, or air purifiers improve indoor air quality and add to the ticket.

Local insight: Denver altitude, codes, and permits

Altitude affects combustion and equipment selection. High-altitude orifice kits and manufacturer-approved derate settings are often required for safe, efficient operation. Many Colorado municipalities, including Denver, require a mechanical permit and inspection for furnace replacement. Expect your installer to pull the permit and schedule inspection.

What to confirm in your quote:

  • Permit and inspection are included
  • Altitude kit and setup are included when required
  • Proper vent material for your efficiency level
  • Gas line sizing and shutoff compliance
  • Carbon monoxide safety testing at startup

Two hard facts that matter:

  • Fix-it 24/7 technicians carry EPA and NATE certifications, which signal tested competency in HVAC service and installation.
  • The company holds an A+ rating with the Better Business Bureau, reflecting consistent service excellence.

Labor and installation: where quality shows up

Labor is the hidden hero of a safe furnace. A lower price can cut corners on venting, gas connections, and commissioning. Your installer should deliver a documented startup that includes combustion checks, temperature rise, static pressure, and a homeowner walkthrough.

What a professional install day includes:

  1. Protecting floors and work areas
  2. Removing the old furnace and recycling materials where possible
  3. Setting and leveling the new unit with correct drain routing
  4. Adapting supply, return, gas, and vent to code
  5. Wiring, thermostat integration, and safety controls
  6. Commissioning, documentation, and manufacturer registration

Ask to see the checklist. Quality control today prevents breakdowns later.

When repair makes sense vs replacement

Not every failure means a new furnace. Consider repair when:

  • The unit is under 10 years old and well maintained
  • The heat exchanger is intact and the repair is minor
  • Parts are available and your utility bills remain reasonable

Replacement often makes sense when:

  • The unit is 15 to 20 years old
  • The heat exchanger is cracked or the furnace is condemned
  • Repair costs exceed 30 to 40 percent of replacement cost
  • You want quieter operation, better airflow, or improved indoor air quality

A thorough diagnostic visit prevents guesswork and identifies the true path to comfort and safety.

Add-ons that improve comfort and influence cost

Smart investments that add value during replacement:

  • High-MERV media filter cabinet for cleaner air and longer filter life
  • Whole-home humidifier to reduce dry winter air and protect wood floors
  • Sealed return drop or added return grille to fix cold rooms
  • Smart thermostat with adaptive learning
  • Fresh-air intake or energy recovery where codes or comfort call for it

These items raise initial cost but can reduce dry-air symptoms, dust, and hot-cold swings.

Financing, rebates, and memberships

Furnace replacement is a planned investment. Many homeowners prefer payments over a lump sum.

Available options with Fix-it 24/7:

  • Financing through partners like Wells Fargo, GreenSky, and GoodLeap, subject to credit approval
  • Transparent, flat-rate pricing with no surprise fees
  • Green Club Membership at $29.95 per month with benefits such as 25% off HVAC repairs, priority scheduling, and free annual furnace and AC deep cleans

Always ask about utility rebates for high-efficiency equipment. Eligibility changes by city and utility, so a site visit helps confirm your options.

How to compare estimates apples to apples

Use this quick checklist when reviewing bids:

  1. Model numbers and efficiency ratings are listed
  2. Permit, inspection, and disposal are included
  3. Venting material, gas line work, and condensate management are specified
  4. Thermostat, filter cabinet, and any IAQ accessories are listed
  5. Labor warranty and manufacturer parts warranty are spelled out
  6. Startup and commissioning report is provided at handoff
  7. Post-install support, 24/7 emergency service, and satisfaction guarantee are documented

A detailed scope speeds installation and avoids change orders.

Timeline: what to expect from call to warm home

  • Phone or online scheduling for a no-obligation assessment
  • In-home evaluation, load review, duct and vent inspection
  • Written, flat-rate proposal with options and financing
  • Permit application and equipment scheduling
  • Installation day, system startup, and homeowner training
  • Inspection coordination and final quality check

Fix-it 24/7 offers 24/7 emergency availability with a fast response window in many areas, so you are never left in the cold.

How to save without sacrificing safety

  • Get a thorough diagnostic first. A deep clean or repair may restore performance.
  • Fix airflow issues during the install to protect your new furnace.
  • Choose the right efficiency for your home and fuel costs, not the highest number on paper.
  • Combine work items on the same day to reduce labor trips.
  • Use memberships for ongoing maintenance and repair discounts.

Smart choices lower lifetime cost and improve comfort across Denver, Aurora, Lakewood, and nearby cities.

Special Offers to Stretch Your Budget

  • Special Offer: $39 Furnace Tune-Up & Deep Clean for new customers. Schedule your $39 Furnace Tune-Up & Deep Clean today. New customers only.
  • Local Special: $39 Lakewood Furnace Tune-Up and Deep Clean.
  • Membership Deal: Green Club Membership for $29.95 per month, including free annual furnace and AC deep cleans, free water heater flush, electrical inspection, 25% off HVAC repairs, and priority scheduling.

These offers are perfect before a replacement decision. A thorough tune-up can confirm whether repair or replacement is the smart move.

What Homeowners Are Saying

"Extremely pleased with the quality and professionalism of the team that came to my home to do a heating system cleaning and maintenance... All around this was probably the best experience I've had with an HVAC service company." –Homeowner, Denver Metro
"When our home heating system boiler started knocking... the boiler was failing and had to be condemned due to dangerous carbon monoxide leaking out... installing a new combi boiler system for our house... I highly recommend Fix-it 24/7 Golden and their team!" –Homeowner, Golden
"Alonso E. just conducted our annual service for our furnace... deep cleaned every part of the system to ensure maximum efficiency and reliability where we live at 8500 ft elevation." –Homeowner, Foothills
"First tech... took a look at my old, almost 40 year old furnace... did a great job at replacing and installing my new furnace and AC system. The company was very responsive and helpful throughout the process." –Homeowner, Denver

Frequently Asked Questions

How much does a furnace replacement cost in the Denver area?

Most projects vary based on size, efficiency, venting, and ductwork. Your exact price needs an in-home evaluation that confirms code, altitude setup, and airflow.

Do I need a permit to replace my furnace?

Yes. Most Colorado municipalities, including Denver, require a mechanical permit and inspection. Your contractor should pull the permit and schedule inspection.

Is a high-efficiency furnace always worth it?

Often, but not always. If venting changes are extensive or gas prices are low, a properly sized standard-efficiency unit may be the better value.

How long does installation take?

A straightforward replacement is usually completed in one day. Complex venting, duct changes, or accessories can extend the timeline.

Can I finance my furnace replacement?

Yes. Fix-it 24/7 offers financing options through partners like Wells Fargo, GreenSky, and GoodLeap, subject to credit approval.

Bottom line

Furnace replacement cost depends on equipment, code, ductwork, and installer quality. With altitude and permit requirements in the Denver area, a detailed, flat-rate proposal is your best protection. Start with a diagnostic to see if repair or cleaning solves the problem. If replacement is right, choose a certified team that commissions the system correctly.

Ready to get a clear, flat-rate quote?

Call Fix-it 24/7 at (720) 734-7243 or schedule at https://fixmyhome.com/ for a no-obligation furnace assessment. New to us? Ask for the $39 Furnace Tune-Up & Deep Clean to verify whether you need replacement or repair. Serving Denver, Aurora, Lakewood, Thornton, Arvada, Boulder, Westminster, Centennial, Lafayette, and Longmont.

Fix-it 24/7 Plumbing, Heating, Air & Electric is Denver’s trusted home-services team. We are EPA and NATE certified, A+ BBB rated, and winners of the Angie’s List Super Service Award. Homeowners count on 24/7 emergency service, a 100% satisfaction guarantee, and honest flat-rate pricing. We specialize in high-efficiency installs, deep-clean maintenance, and safety-first repairs. Financing is available through partners like Wells Fargo, GreenSky, and GoodLeap. Proudly serving the Denver metro and foothills communities.

© 2025 Website powered by Peakzi. All rights reserved.

v0.9.6