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Compare HVAC costs in Longmont, CO (2026)

Not sure where to start with HVAC in Longmont? Below is every project side by side — local 2026 pricing and what each is best suited for. The most budget-friendly option here is Furnace Replacement (from $4,350).

Furnace ReplacementBest value$4,350 – $7,800
Best for: Lowest upfront cost for homes with gas heatTypically $6,100
Central AC Installation$5,450 – $11,650
Best for: Cooling only — pairs with an existing furnaceTypically $8,550
Heat Pump Installation$7,050 – $12,850
Best for: Most efficient; heats and cools in one systemTypically $9,950
Full HVAC System Replacement$8,650 – $16,000
Best for: Best when both heating and cooling are dueTypically $12,350

Often paired with HVAC in Longmont

These tend to come up alongside HVAC work for Longmont homeowners.

Insulation
Attic Insulation
Typical 2026$1,600 – $6,500
Best time to buy

Cheapest time for hvac in Longmont

Why spring and fall are cheaper: contractors have open calendar space and compete harder for the work. Why summer and deep winter are expensive: a broken system in extreme weather isn't optional, so you lose your negotiating leverage.

Best window
Spring and fall (Mar–May, Sep–Oct)
Avoid
Peak summer and mid-winter
Off-peak savings
5–15%
FAQ

HVAC in Longmont

How much does hvac work cost in Longmont?

HVAC costs in Longmont span $4,350 to $16,000 in 2026, depending on which project you choose. Furnace Replacement is the cheapest entry point (from $4,350); Full HVAC System Replacement sits at the top end (up to $16,000).

Which hvac option is cheapest in Longmont?

Furnace Replacement comes in lowest in Longmont, usually around $6,100 — it's the right fit if you're dealing with Lowest upfront cost for homes with gas heat.

When is the cheapest time for hvac work in Longmont?

Time it for spring and fall (mar–may, sep–oct) and you'll typically save 5–15% versus peak pricing. Peak summer and mid-winter is the window to avoid.

How do I choose the right hvac option in Longmont?

Match the project to your home's needs and budget — each option above lists what it's best for. Get 2–3 local quotes for your top choice and compare on scope, warranty and equipment tier, not just the headline price.

Estimates are localized to Longmont (cold climate) using local labor price levels, climate factors and permit fees. Always confirm with local contractors.