Furnace Replacement cost: Boise vs Idaho Falls (2026)
The two metros aren't quite in sync on furnace replacement: Boise sits 2% above Idaho Falls, or roughly $5,850 versus $5,750 — about $100 apart.
Boise ID
Typically around $5,850
Idaho Falls ID
Lower costTypically around $5,750
Boise vs Idaho Falls: full breakdown
| Factor | Boise | Idaho Falls |
|---|---|---|
| Typical 2026 cost | $5,850 | $5,750 |
| Estimated range | $4,150–$7,500 | $4,100–$7,350 |
| Labor index (vs US) | ×0.96 | ×0.95 |
| Climate zone | Cold | Cold |
| Climate factor | ×1.08 | ×1.08 |
| Local permit | $200 | $200 |
| Labor share | $3,500 | $3,450 |
| Materials/equipment | $2,350 | $2,300 |
Localized 2026 planning estimates — not quotes. Each city adjusts the national furnace replacement range for local labor, climate and permits.
How much should this gap actually matter?
At 2%, this gap is small enough that it's usually swallowed by normal quote-to-quote variation for furnace replacement — focus on the contractor, not the city.
Furnace replacement by type: Boise vs Idaho Falls
Every furnace replacement type gets its own localized price for each metro, using the same labor, climate and permit adjustments — a true apples-to-apples comparison.
| Type | Boise | Idaho Falls |
|---|---|---|
| Gas furnace | $4,050–$7,400 | $4,000–$7,250 |
| High-efficiency gas furnace | $3,650–$7,400 | $3,550–$7,250 |
| Electric furnace | $2,300–$4,900 | $2,250–$4,800 |
All figures are 2026 localized planning estimates for furnace replacement — get an actual quote before you commit.
Furnace replacement by home size: Boise vs Idaho Falls
Furnace cost scales with the heating capacity (BTU) your home needs — roughly 40–45 BTU per square foot in a mixed climate. Larger homes need a bigger unit and more ductwork.
| Size | Boise | Idaho Falls |
|---|---|---|
| 1,000 sq ft (≈45,000 BTU) | $3,100–$5,600 | $3,050–$5,500 |
| 1,500 sq ft (≈68,000 BTU) | $3,650–$6,450 | $3,550–$6,350 |
| 2,000 sq ft (≈90,000 BTU) | $4,150–$7,500 | $4,100–$7,350 |
| 2,500 sq ft (≈110,000 BTU) | $4,800–$8,550 | $4,700–$8,350 |
| 3,000 sq ft (≈130,000 BTU) | $5,400–$9,550 | $5,300–$9,400 |
| 3,500+ sq ft (≈150,000 BTU) | $6,050–$10,600 | $5,900–$10,400 |
Treat these as 2026 localized estimates for furnace replacement, not quotes from a contractor.
Cheapest time for furnace replacement in either city
HVAC demand collapses in the mild shoulder seasons, so installers discount to keep crews busy. The most expensive time to buy is during a heat wave or cold snap, when a dead system forces a full-price emergency replacement.
How much should you really budget for HVAC in 2026?
An HVAC budget isn't one number — it's a set of trade-offs between sizing accuracy, efficiency tier and brand. Our editors walk through how each one moves the price.
The longevity case
The single biggest cost driver isn't the brand — it's correct sizing and install quality. A properly sized, well-commissioned mid-tier system with annual maintenance outlasts an oversized premium unit that short-cycles. Spend on the install, not the badge.
The efficiency-first case
In a hot-summer or cold-winter region, a higher SEER2/AFUE unit — or a heat pump — earns its premium back in lower bills, and utility and state rebates can still cut into the sticker (the federal 25C/25D credits ended Dec 2025). Run the payback math before defaulting to the cheapest box.
The budget-first case
Size the system to your home with a Manual J calculation and buy the standard efficiency tier (80% AFUE / 14.3 SEER2). In a mild climate the cheaper unit pays off because you rarely run it hard — paying for premium efficiency you won't use is the most common way to overspend.
The brand on the unit matters far less than getting the sizing and installation right. Insist on a Manual J calculation, match efficiency to your climate, and claim every rebate available.
Boise vs Idaho Falls
Is furnace replacement cheaper in Boise or Idaho Falls?
Yes — Boise costs more. Expect around $5,850 for furnace replacement there against $5,750 in Idaho Falls, about $100 (2%) apart in 2026.
Why does furnace replacement cost more in Boise than Idaho Falls?
Boise's higher labor index (0.96 vs 0.95 in Idaho Falls) is the biggest factor, with the cold/cold climate split playing a smaller role.
How much is furnace replacement in Boise, ID?
furnace replacement in Boise runs $4,150–$7,500 as of 2026 — most jobs land near $5,850.
When is the cheapest time to buy furnace replacement — and does it differ by city?
No, the seasonal pattern is the same in Boise and Idaho Falls: book during Spring and fall (Mar–May, Sep–Oct) for about 5–15% in savings. Peak summer and mid-winter is the priciest stretch in both cities, mostly due to emergency replacements.
Should I choose where to live based on furnace replacement cost?
Probably not. Yes, $100 is a real gap, but it's a one-time cost you can partly offset in Boise with off-season timing and tighter bids. Long-term factors like energy prices and home condition matter more than this one number.
Compare furnace replacement in other cities
Updated June 2026 · By Serhat Özçelik