HVAC Calculators

CFM: Natural Gas or Propane Furnace | Electric Resistance Heat | Oil Fired Furnace
Refrigerant Weight: Calculator
Target Superheat: Calculator
A/C – HP Critical Reading Diagnostic Form: Download(xls)

CFM Calculator: Natural Gas or Propane Furnace

Enter BTU/HR:

Enter Combustion Efficiency:

Enter Delta T:

Please enter parameters

CFM Calculator: Electric Resistance Heat

Enter Volts:

Enter Amps:

Enter Delta T:

Please enter parameters

CFM Calculator: Oil Fired Furnace

Enter GPH of Nozzle:

Enter Combustion Efficiency:

Enter Delta T:

Please enter parameters

Refrigerant Weight Calculator

Please Select the Refrigerant Type and OD Tubing Size

Refrigerant Type

R-410A R-22 R-407C R-422B R-438A

Liquid Tube OD Size

1/4" 5/16" 3/8"

Vapor Tube OD Size

3/8" 1/2" 5/8" 3/4" 7/8" 1-1/8"

Enter Feet of Line Set:

Please enter parameters

Target Superheat Calculator

Enter Indoor Wet Bulb:

Enter Outdoor Dry Bulb:

Please enter parameters

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The specific calculation method of the above calculator is referenced from AC Service Tech, A/C – HP Critical Reading Diagnostic Form is from yorkcentraltechtalk, and we only organize it for convenience.