At CountBricks, our AI estimate engine fields thousands of voice requests each month. Few questions appear as often as “how much to replace a gas furnace.” For Nashville-area homeowners—and anyone upgrading a residential HVAC system—the answer is shaped by four primary variables: equipment size, efficiency rating, installation complexity, and local code requirements. Understanding each factor can turn a budget guess into a confident project plan.
A 60,000-BTU unit for a compact bungalow costs far less than a 100,000-BTU unit for a 3,500 sq ft suburban home. CountBricks voice takeoffs calculate required capacity from square footage, insulation R-values, and duct layout, giving you an exact equipment range in seconds.
Standard 80% AFUE models remain legal in many states, but Nashville’s growing push for high-efficiency systems means 90-96% AFUE furnaces are increasingly popular. Higher AFUE saves on future gas bills but adds 15-25 % to upfront material cost. CountBricks cost simulations display the payback timeline so you can see whether the upgrade pencils out.
Replacing “like-for-like” in a basement utility room is straightforward. Relocating the furnace, resizing ductwork, or adding sealed combustion air brings extra labor. Using field audio, our platform logs every detail the moment your contractor spots it, guaranteeing the final estimate reflects reality—not wishful thinking.
Metro Nashville requires mechanical permits plus inspections for flue venting and gas piping. Permit fees are modest (usually under $150) but code-driven upgrades such as carbon monoxide monitors or new gas shut-off valves can add several hundred dollars. CountBricks auto-adds these line items so nothing slips through the cracks.
• Entry-Level 80% AFUE, ≤70,000 BTU, minimal duct work: $3,400–$4,600
• Mid-Grade 92% AFUE, 70,000–90,000 BTU, minor duct tweaks: $4,800–$6,200
• Premium 96% AFUE, ≥90,000 BTU, full vent re-route: $6,500–$8,800
Prices include demolition, haul-off, new thermostat, startup, and county inspection coordination. Use these ranges as a starting point; CountBricks.com/estimate will refine numbers to your exact floor plan.
• Voice-to-Estimate Workflow: Talk through the job while onsite; our AI builds a live itemized quote.
• Real-Time Material Pricing: We pull current wholesale furnace costs from regional suppliers every five minutes.
• Dynamic Labor Rates: Local wage data keeps labor accurate—no outdated flat rates.
• Instant Proposal Builder: One tap converts your estimate into a branded PDF homeowners can e-sign.
1. Voice Walkthrough: Record room dimensions and existing unit details in the CountBricks mobile app.
2. AI Capacity Calculation: Our system sizes the furnace and suggests AFUE tiers.
3. Permit Auto-Fill: The platform pre-populates Nashville mechanical permit forms for your review.
4. Material Reservation: Secure equipment at quoted pricing directly through CountBricks procurement.
5. Installation Day: Typical swap-outs take 6–9 hours; complex re-routes may run two days.
6. Post-Install Audit: Upload furnace serial numbers and start-up readings—CountBricks archives everything for warranty claims.
Tennessee Valley Authority rebates and federal 25C tax credits can offset up to $600 on high-efficiency gas furnaces. CountBricks automatically flags eligible incentives in your proposal and supplies the homeowner with completed rebate paperwork.
• Choose a variable-speed blower to improve comfort and reduce noise
• Pair the furnace with a smart thermostat for an extra 8–10 % energy savings
• Schedule replacement in shoulder seasons (spring or fall) when HVAC crews offer discounted labor
• Seal and insulate duct runs—25 % of heated air is commonly lost in leaks
• Keep records in CountBricks Cloud; documentation boosts resale value and speeds warranty service
From blueprint takeoffs to final invoicing, CountBricks compresses hours of office work into minutes of conversation. Residential builders leverage:
• CountBricks.com/services for turnkey estimating and scheduling
• CountBricks.com/portfolio to showcase completed HVAC upgrades to prospective clients
• CountBricks AI Chat Support for code clarifications 24/7
Ready to replace that aging furnace? Start a live voice session on the CountBricks app, or request a callback at CountBricks.com/consultation. In less than five minutes you’ll know exactly how much to replace a gas furnace—down to the last pipe hanger.
A 2,800 sq ft home in Franklin was battling a 20-year-old 75 % AFUE furnace. The homeowner contacted their contractor, who opened the CountBricks app on-site.
• Voice walkthrough captured room sizes, attic insulation depth, and gas line location in under 4 minutes
• AI recommended a 90,000 BTU, 95 % AFUE two-stage furnace for optimal load balance
• Real-time supplier pricing locked in equipment at $2,350, avoiding a pending price hike
• Labor forecast showed 11 crew-hours because of a flue re-route; bid adjusted automatically
• Total contract price: $6,740, including permit, smart thermostat, and duct sealing
Installation finished in one day, and blower test results uploaded directly to CountBricks Cloud passed inspection first time. The homeowner received an automated rebate form worth $450, emailed from CountBricks.com/services the same afternoon.
• Bundle AC replacement: Swapping furnace and condenser together can trim labor by 10 %
• Opt for pre-fabricated vent kits to cut onsite fabrication time
• Use CountBricks scheduling to sequence rough-in and finish crews, minimizing downtime
Start a free demo at CountBricks.com/consultation and see how instantly generated, line-item estimates turn prospects into signed contracts—no spreadsheets, no surprises.
