PHIUS+ 2018
Space Conditioning Criteria Calculator
CALCULATOR method should be used for certification and is based on Envelope-to-Floor Area ratio.
ESTIMATOR method approximates Envelope-to-Floor Area ratio based on Floor Area alone. 
  Floor Area (ft2) or enter here:      
Total Occupancy or enter here:
*Estimator method is used to approximate for early design, not for final certification targets. 
Envelope/iCFA or enter here:
iCFA/person or enter here:
*Calculator method is used for official certification targets. 
Space Conditioning Criteria
Annual Heating Demand  kBTU/ft²yr
Annual Cooling Demand kBTU/ft²yr
Peak Heating Load BTU/ft²hr
Peak Cooling Load BTU/ft²hr
Typed entry will override sliding scale. 
The results of the CALCULATOR method take precedence over the ESTIMATOR method.