TryBuildCalc

Mini-Split BTU Verification Checklist

Essential Checklist+

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

✓7 Inspection Points
✓4 Verification Categories
✓Zone & Climate Inputs+
  • Each zone's square footage measured for that room specifically, not estimated from a whole-home total divided evenly
  • Climate zone selection confirmed against your actual location, not just guessed from general region
✓Before Purchasing Equipment+
  • An ACCA Manual J load calculation obtained from a licensed HVAC contractor before purchasing equipment
  • Confirmed each indoor head isn't being oversized "to be safe"
  • Indoor head(s) and outdoor unit confirmed as an actual AHRI-certified matched combination, not mixed-and-matched by BTU total alone
✓Indoor Head Placement & Refrigerant Lines+
  • Refrigerant line brazing/connection, vacuum/charge work, AND connecting/disconnecting any pre-charged quick-connect line set confirmed performed by an EPA Section 608-certified technician
✓Installation & Safety+
  • Line set vacuum-tested (evacuated and held) before refrigerant charge is released, not skipped to save time
Full QC Checklist+

Verify zone/climate inputs, the equipment-purchasing decision, indoor head placement/refrigerant lines, installation safety, and post-installation verification.

✓21 Inspection Points
✓5 Verification Categories
✓Zone & Climate Inputs+
  • Each zone's square footage measured for that room specifically, not estimated from a whole-home total divided evenly
  • 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
  • Sun/window exposure selection checked PER ZONE against that room's actual window count, size, and orientation
  • Ceiling height entered for the actual room, not left at the 8 ft default — especially for a vaulted or cathedral-ceiling zone
✓Before Purchasing Equipment+
  • An ACCA Manual J load calculation obtained from a licensed HVAC contractor before purchasing equipment
  • Confirmed each indoor head isn't being oversized "to be safe"
  • Indoor head(s) and outdoor unit confirmed as an actual AHRI-certified matched combination, not mixed-and-matched by BTU total alone
  • Refrigerant line set length and elevation change between indoor and outdoor units checked against the specific system's maximum rated length
  • Local permit requirements and electrical circuit capacity checked before scheduling installation
✓Indoor Head Placement & Refrigerant Lines+
  • Indoor head mounting height and clearance (from ceiling, walls, and any obstruction to airflow) confirmed against the manufacturer's installation manual
  • Wall penetration for the line set sealed and sloped correctly (slightly toward the outdoor side) to prevent water intrusion
  • Condensate drain line confirmed sloped and clear, with a condensate pump installed where gravity drainage isn't possible
  • Refrigerant line brazing/connection, vacuum/charge work, AND connecting/disconnecting any pre-charged quick-connect line set confirmed performed by an EPA Section 608-certified technician
✓Installation & Safety+
  • Outdoor unit electrical disconnect installed within sight of the unit, sized for its actual amperage draw
  • Indoor head mounting bracket confirmed secured to structural framing (studs) rather than drywall/plaster alone
  • Outdoor unit placement confirmed with adequate clearance for airflow, service access, and away from dryer vents or excessive debris
  • Line set vacuum-tested (evacuated and held) before refrigerant charge is released, not skipped to save time
✓After Installation+
  • System startup/commissioning performed by the installer, verifying refrigerant charge and airflow against manufacturer spec for each zone
  • Remote control/thermostat (and WiFi app, if equipped) tested for each zone independently before considering the job complete
  • Filter cleaning schedule established for each indoor head, not treated as a one-time installation
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

Mini-Split BTU 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.