Assess Current System
2-4 hoursEvaluate system age (15-20 year lifespan), efficiency rating (SEER2, AFUE), repair history, and sizing adequacy.
Field context
This workflow is part of 3 niche fields
Free step-by-step hvac replacement for homeowners replacing AC/furnace. Plan hvac replacement with calculators and checklists covering assess current system.
Evaluate system age (15-20 year lifespan), efficiency rating (SEER2, AFUE), repair history, and sizing adequacy.
Require Manual J load calculation from contractor — never size by square footage alone. Compare SEER2 16+ and variable-speed options.
Schedule install in moderate weather, clear access to equipment, and plan for 4-8 hours without HVAC.
Verify installation per manufacturer specs, register warranty, schedule annual maintenance, and replace filters monthly.
Compare energy costs of old vs new system efficiency. · Track energy bill savings post-installation.
Estimate HVAC energy consumption by SEER2 rating.
Budget $5,000-$12,000 for full system replacement.
Typical US replacement costs and efficiency ratings.
| System | Cost Range | Efficiency | Lifespan |
|---|---|---|---|
| Central AC (SEER2 16) | $4K-$8K | Good | 15-20 years |
| Heat pump | $5K-$10K | Excellent | 15-20 years |
| Gas furnace (95% AFUE) | $3K-$6K | Good | 15-25 years |
| Full system (AC + furnace) | $8K-$15K | Best value | 15-20 years |
A properly sized mid-tier system outperforms an oversized premium unit — insist on Manual J calculation.
HVAC pricing varies 30-50% for identical equipment — three quotes reveal fair market price.
Dirty filters are the #1 cause of HVAC failure and efficiency loss — $10 filter saves $100s in repairs.