Gas Furnace Replacement Proposal Template
Comprehensive scope for replacing aging gas heating systems with two-stage or modulating condensing gas furnaces. Protects against gas piping and venting surprises.
Complete Scope of Work
Copy or customize these verbatim specifications into your contractor proposal.
1. Removal & Fuel Shutoff
Safe gas isolation and removal of existing furnace.
- Shut off gas supply at appliance shutoff valve and verify zero residual line pressure.
- Disconnect electrical supply, flue connection, and duct plenum collars.
- Remove obsolete furnace unit from premises for legal metal recycling.
2. Furnace Placement & Sheet Metal Fabrication
Furnace setting, return drop modification, and filter integration.
- Position new high-efficiency gas furnace on rubber isolation blocks to minimize mechanical resonance.
- Fabricate custom galvanized sheet metal supply and return transitions.
- Install high-capacity 4-inch media air filter cabinet for reduced static pressure and superior air filtration.
3. Gas Line, Venting & Drainage
Gas piping, combustion intake/exhaust, and condensate management.
- Install new black iron gas piping connection with manual shutoff valve, sediment trap (drip leg), and union.
- Install dual-pipe PVC/CPVC or concentric direct-vent system through exterior wall/roof according to manufacturer specs.
- Plumb acidic furnace condensate drain line with neutralizer kit to nearest floor drain or auxiliary pump.
4. Startup, Safety Testing & Warranty
Combustion analysis, safety switches, and warranties.
- Perform clock meter test for correct gas input rate and test manifold gas pressure with digital manometer.
- Check temperature rise across heat exchanger against unit nameplate specifications.
- Verify operation of high-limit switch, flame rollout sensor, and door safety interlock.
- 10-Year parts warranty and 20-year/lifetime heat exchanger warranty upon registration.
Standard Line-Item Material Allowances
Clear material specifications that protect against ambiguous scope arguments.
| Component / Assembly | Standard Specification | Unit / Allowance |
|---|---|---|
| High-Efficiency Gas Furnace | 96% AFUE Two-Stage ECM Variable Speed | 1 Unit |
| Concentric Vent Kit | Schedule 40 PVC/CPVC direct combustion vent | 1 Assembly |
| Media Air Cleaner | 4-Inch MERV 11 filter cabinet with seal | 1 Unit |
| Condensate Neutralizer | Inline limestone neutralizing capsule | 1 Unit |
| Gas Drip Leg & Flex Assembly | Black iron pipe, shutoff valve, sediment trap | 1 Kit |
Scope-Gap Protections: 3 Clauses to Include
These contractual gotchas account for 85% of change-order arguments on gas furnace replacement proposal templates.
The Risk: 80% furnaces vent into metal B-vent chimneys; 90%+ condensing furnaces require PVC sidewall or roof penetrations.
Protective Clause: Specifies that new dedicated dual PVC venting to the exterior is included, while closing/abandoning unused chimney openings is detailed.
The Risk: Higher BTU furnaces or low gas pressure can starve equipment during peak winter demand.
Protective Clause: Verifies that gas pipe sizing calculation per IFGC is completed before hookup; main gas meter regulator upgrades remain utility responsibility.
The Risk: Furnaces located in closets or small basements can starve of air if direct outside air intake is omitted.
Protective Clause: Explicitly details direct-vent sealed combustion piping to draw 100% combustion air from outside the home.
Governing Building Codes & Standards
Frequently Asked Questions
What is the difference between 80% and 96% AFUE gas furnaces?▾
An 80% furnace loses 20 cents of every fuel dollar up the metal chimney flue. A 96% condensing furnace extracts heat from combustion gasses using a secondary stainless-steel heat exchanger, venting cool plastic exhaust and significantly cutting monthly heating costs.
Is a carbon monoxide detector mandatory during furnace replacement?▾
Yes. Most state and municipal building codes require working, interconnected carbon monoxide alarms outside each sleeping area whenever fuel-burning appliances are replaced.
Related HVAC Proposal Scopes
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