How Much Does a New Furnace Cost?

How Much Does a New Furnace Cost?

​If you’re asking “How much does a new furnace cost?”, you’re looking for real numbers that help you budget for one of the biggest home comfort investments — especially in a climate like Thornton’s, where winters get cold and your furnace works hard.
👉 The cost of a new furnace varies, but most homeowners in Colorado spend between $3,000 and $9,000 installed, depending on system type, efficiency, size, and installation complexity.
Below is an easy-to-read cost breakdown, what affects price, and tips to save money — all designed to answer search intent clearly and help your decision.

Quick Answer: How Much Does a New Furnace Cost?

• Lowest end (basic gas furnace): $3,000 – $4,500 installed
  
• Mid-range furnace: $4,500 – $7,000 installed
  
• High-efficiency model: $7,000 – $9,000+ installed
  
• Electric furnace: $2,500 – $5,500 installed
  

These are typical cost ranges in Thornton and nearby Denver-area markets.

1. Cost by Furnace TypeGas Furnace (Most Common)$3,000 – $9,000 installed
Natural gas furnaces are the most popular choice in Colorado. Costs vary based on:

• AFUE rating (efficiency)
  
• Size (BTU capacity)
  
• Brand
  
• Single vs two-stage vs modulating operation
  

Electric Furnace$2,500 – $5,500 installed
Electric furnaces cost less upfront but can cost more to run when electricity prices are high. Great for supplemental or zoned heating.
Propane Furnace$3,500 – $8,500 installed
Used in areas without natural gas. Propane units cost more for fuel but perform reliably.

2. Cost Based on Efficiency (AFUE Rating)AFUE (Annual Fuel Utilization Efficiency) measures how well a furnace converts fuel to heat.
AFUE RatingExpected CostWhat You Get80% – 85%$3,000 – $4,500Standard efficiency
90% – 95%$4,500 – $7,000Better efficiency & lower bills
95% – 98%+$7,000 – $9,500+Top efficiency & biggest savingsHigher efficiency furnaces cost more upfront but save money over time — especially in Colorado’s long heating season.

3. Furnace Size and CostFurnaces are sized in BTUs and must match your home’s heating load.
Home SizeEstimated Furnace SizeTypical Installed Cost~1,000 sq ft60,000 – 80,000 BTU$3,000 – $5,000
~1,500 sq ft80,000 – 100,000 BTU$4,000 – $6,000
~2,000 sq ft100,000 – 120,000 BTU$5,500 – $8,000
~2,500+ sq ft120,000+ BTU$6,500 – $9,500+A proper Manual J load calculation ensures your furnace isn’t oversized or undersized — both of which waste money.

4. Labor & Installation CostsLabor usually accounts for 30–40% of total cost and depends on:

• System complexity
  
• Ductwork condition
  
• Accessibility (attic/crawlspace)
  
• Electrical or gas line upgrades
  

Typical labor charges in Thornton: $1,000 – $2,500 of the total install.

5. Additional Costs That Affect PriceDuctwork Repair or Replacement$500 – $5,000+
Undersized, leaky, or inefficient ducts increase installation cost and reduce comfort.
Electrical or Gas Line Work$200 – $1,500
Older homes may need upgrades.
Permits & Inspections$100 – $500
Required in most municipalities, including Thornton.
Thermostat Upgrade$100 – $500
Smart or zoning thermostats add comfort and efficiency.

6. Is a High-Efficiency Furnace Worth the Extra Cost?Yes — especially in a climate with strong heating demand.

• Lower monthly fuel bills
  
• Better comfort control
  
• Higher resale appeal
  
• Potential rebates
  

Many Colorado utilities and manufacturers offer rebates on high-efficiency systems.

7. Furnace Installation vs Furnace ReplacementReplacement usually costs less because:

• No new ductwork
  
• Less labor
  
• Existing systems can be matched
  

New installation (when no furnace exists) typically costs more.

8. Typical Furnace LifespanA properly maintained furnace lasts 15–20 years.
Signs it’s time to replace instead of repair:

• Frequent breakdowns
  
• Rising energy bills
  
• Uneven heating
  
• System older than ~15 years
  

Replacing before total failure avoids emergency repair costs.

9. How to Save on Furnace Costs

• Schedule maintenance annually
  
• Seal duct leaks and insulate your home
  
• Consider financing plans
  
• Take advantage of rebates and tax credits
  
• Install a programmable or smart thermostat
  

Smart planning can reduce lifetime costs more than any single product choice.

10. Financing & RebatesMany homeowners use financing options to spread the cost:

• 0% interest HVAC financing
  
• Low-interest loans
  
• Utility rebates
  
• Federal energy tax credits
  

These programs lower upfront cost and improve ROI.

Frequently Asked QuestionsHow much does a typical furnace cost installed?Most new furnaces installed in Thornton cost $3,000 to $9,000, depending on type and efficiency.
What affects furnace cost the most?Furnace type, efficiency rating (AFUE), size, labor, and ductwork condition are the biggest cost drivers.
Do high-efficiency furnaces save money?Yes. They cost more upfront but use less fuel and lower monthly heating bills.
How long does a furnace last?With proper maintenance, furnaces typically last 15–20 years.