TryBuildCalc

Heat Pump Size Verification Checklist

Essential Checklist+

Complete these critical checks before approving the work or proceeding to the next construction stage.

✓11 Inspection Points
✓4 Verification Categories
✓Load & Climate Inputs+
  • Square footage entered is conditioned (heated/cooled) floor area only, not garages, unfinished attics/basements, or porches
  • Climate zone selection confirmed against your actual location, not just guessed from general region
  • Heat Pump Type (Standard vs. Cold-Climate) selected deliberately for your actual climate, not left at the default
✓Before Purchasing Equipment+
  • An ACCA Manual J load calculation obtained from a licensed HVAC contractor before purchasing equipment
  • Balance point and backup heat sizing cross-checked against a specific manufacturer's actual extended-range performance data (AHRI-rated capacity at multiple temperatures), not just this calculator's typical retention curve
  • Confirmed the heat pump isn't being oversized "to be safe" beyond either the cooling-based baseline or the calculated heating-led planning alternative
  • Final choice between the cooling-based baseline and the heating-led planning alternative deferred to a licensed HVAC contractor's actual ACCA Manual J/Manual S evaluation and manufacturer performance data
✓Backup Heat & Controls+
  • Installed backup heat strip kW matches this calculator's estimate (or the contractor's own more detailed calculation), not left at whatever the installer had on hand
  • Thermostat/controls configured with the correct balance point or backup-heat lockout temperature, not left at a generic default
✓Installation+
  • Electrical circuit/breaker sized for the COMBINED draw of the compressor AND backup heat strip, not just the compressor alone
  • Refrigerant line brazing/connection and vacuum/charge work confirmed performed by an EPA Section 608-certified technician
Full QC Checklist+

Verify load/climate inputs, the equipment-purchasing decision, backup heat and controls, installation, and post-installation verification.

✓21 Inspection Points
✓5 Verification Categories
✓Load & Climate Inputs+
  • Square footage entered is conditioned (heated/cooled) floor area only, not garages, unfinished attics/basements, or porches
  • Climate zone selection confirmed against your actual location, not just guessed from general region
  • Insulation quality assessed honestly rather than defaulting to Average without checking
  • Heat Pump Type (Standard vs. Cold-Climate) selected deliberately for your actual climate, not left at the default
✓Before Purchasing Equipment+
  • An ACCA Manual J load calculation obtained from a licensed HVAC contractor before purchasing equipment
  • Balance point and backup heat sizing cross-checked against a specific manufacturer's actual extended-range performance data (AHRI-rated capacity at multiple temperatures), not just this calculator's typical retention curve
  • Confirmed the heat pump isn't being oversized "to be safe" beyond either the cooling-based baseline or the calculated heating-led planning alternative
  • Final choice between the cooling-based baseline and the heating-led planning alternative deferred to a licensed HVAC contractor's actual ACCA Manual J/Manual S evaluation and manufacturer performance data
  • Indoor coil/air handler and outdoor unit confirmed as an actual AHRI-certified matched combination
  • If pairing with an existing gas furnace ("dual fuel"/hybrid system) rather than pure electric backup heat, confirmed this is compatible with your existing furnace and controls
✓Backup Heat & Controls+
  • Installed backup heat strip kW matches this calculator's estimate (or the contractor's own more detailed calculation), not left at whatever the installer had on hand
  • Thermostat/controls configured with the correct balance point or backup-heat lockout temperature, not left at a generic default
  • Emergency heat mode explained to the homeowner as a manual override for compressor failure, not a normal operating mode
  • Defrost cycle operation explained to the homeowner (brief reversals that can look like the system "blowing cold air" in winter)
✓Installation+
  • Refrigerant line set length and elevation change between indoor and outdoor units checked against the specific system's maximum rated length
  • Electrical circuit/breaker sized for the COMBINED draw of the compressor AND backup heat strip, not just the compressor alone
  • Outdoor unit placement confirmed with adequate clearance for airflow/service access, and defrost condensate drainage routed away from walkways
  • Refrigerant line brazing/connection and vacuum/charge work confirmed performed by an EPA Section 608-certified technician
✓After Installation+
  • System startup/commissioning performed by the installer, verifying refrigerant charge and airflow against manufacturer spec
  • Backup-heat lockout/balance point setting verified operating as intended after the first genuinely cold snap, not just assumed correct from initial commissioning
  • Filter cleaning/replacement schedule established, not treated as a one-time installation task
Inspection Notes+
Use the latest approved drawings, specifications, and site measurements.
Complete all critical checks before proceeding to the next work stage.
Record deviations and confirm rectification where required.

Related Calculators & Guides

Heat Pump Size CalculatorOpen the related calculator and verify the current project inputs.

FAQ

Use it after collecting the project inputs and again before approving or closing the relevant work stage.
No. It supports verification but does not replace approved drawings, specifications, codes, manufacturer requirements, or professional inspection.