How much does a furnace replacement cost in Castle Rock, CO?
US national rangeUpdated Prices checked October 20261 source
A furnace replacement costs $2,823 to $6,896 nationally, typical $4,814. We have no documented price index for Castle Rock for this job, so this is the US national range from HomeAdvisor, checked October 2026.
US national range, not adjusted for this city
- Low
- $2,823
- Typical
- $4,814
- High
- $6,896
Furnace replacement cost in Castle Rock, CO
We have no documented price index for Castle Rock for this job, so the table shows the US national range.
| Estimate | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| US national range | $2,823 | $4,814 | $6,896 | Per system, installed; typical range of customer-reported jobs (HomeAdvisor) | October 2026 |
Furnace replacement cost by type or size
US national figures in USD, as published by each source.
| Type or size | Price (USD) | Source |
|---|---|---|
| Electric furnace | $2,000 to $7,000 | HomeAdvisor |
| Gas furnace | $3,800 to $10,000 | HomeAdvisor |
| Oil furnace | $6,750 to $10,000 | HomeAdvisor |
What drives the cost of a furnace replacement
Fuel type
Electric furnaces cost least to install; oil costs the most.
Efficiency rating
High-AFUE furnaces cost more up front.
Home size
Furnaces are sized at roughly 30 to 60 BTUs per square foot.
Climate
Colder regions need more capacity.
Removal of the old unit
Removal and disposal typically add $150 to $330.
Permits and what's included in Castle Rock
Permit note
Furnace replacement usually needs a mechanical permit, and gas work may need its own. Ask your local building department for the fee.
Rules are set locally; confirm with Castle Rock’s building department.
What’s usually included
- The new furnace
- Connection to existing ducts, venting and fuel supply
- Startup and testing
Scopes vary. Get the scope in writing on every quote.
Get furnace replacement quotes in Castle Rock
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Top-ranked HVAC contractors in Castle Rock
The top 3 of 503 HVAC contractors we rank for Castle Rock, CO, by CR Score. Paid placement never changes rank.
- #1Nytech Heating, Cooling, and PlumbingCR Score 675.0from 2,828 Google reviews
- #2Mountain Air Comfort SystemsCR Score 634.9from 285 Google reviews
- #3Plumbline ServicesCR Score 634.7from 9,085 Google reviews
Furnace replacement cost in Castle Rock: questions
How much does a furnace replacement cost in Castle Rock, CO?
Do I need a permit for a furnace replacement in Castle Rock?
What affects the cost of a furnace replacement?
How many HVAC contractors serve Castle Rock?
What is usually included in the price?
Sources
Checked October 2026. Figures are estimates, not quotes.
- HomeAdvisor: Furnace replacement cost · page updated June 17, 2026 · checked October 2026Primary source. Used for: Low, typical and high; prices by fuel; drivers.
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