Cooling

Cooling system type

HPXML provides two difference HVAC system elements that can provide cooling: CoolingSystem that only provides cooling and HeatPump which can provide heating and cooling.

Heat Pump

The HeatPump element in HPXML can represent either an air-source heat pump or ground source heat pump in HEScore. Which is specified in HEScore is determined by the HeatPumpType element in HPXML according to the following mapping.

Heat Pump Type mapping
HPXML Heat Pump Type HEScore Cooling Type
water-to-air gchp
water-to-water gchp
air-to-air heat_pump
mini-split heat_pump
ground-to-air gchp

Cooling System

The CoolingSystem element in HPXML is used to describe any system that provides cooling that is not a heat pump. The CoolingSystemType subelement is used to determine what kind of cooling system to specify for HEScore. This is done according to the following mapping.

Cooling System Type mapping
HPXML Cooling System Type HEScore Cooling Type
central air conditioning split_dx
room air conditioner packaged_dx
mini-split split_dx
evaporative cooler split_dx
other not translated

Note

If an HPXML cooling system type maps to not translated the translation will fail.

Evaporative coolers are approximated in HEScore by a high efficiency central air (split_dx) system.

Cooling Efficiency

Cooling efficiency can be described in HEScore by either the rated efficiency (SEER, EER), or if that is unavailable, the year installed/manufactured from which HEScore estimates the efficiency based on shipment weighted efficiencies by year. The translator follows this methodology and looks for the rated efficiency first and if it cannot be found sends the year installed.

Rated Efficiency

HEScore expects efficiency to be described in different units depending on the cooling system type.

HEScore cooling type efficiency units
Cooling Type Efficiency Units
split_dx SEER
packaged_dx EER
heat_pump SEER
gchp EER

The translator searches the CoolingSystem/AnnualCoolingEfficiency or HeatPump/AnnualCoolEfficiency elements of the primary cooling system and uses the first one that has the correct units.

Evaporative coolers are always assumed to be a split_dx system with an efficiency of SEER 28.

Shipment Weighted Efficiency

When an appropriate rated efficiency cannot be found, HEScore can accept the year the equipment was installed and estimate the efficiency based on that. The year is retrieved from the YearInstalled element, and if that is not present the ModelYear element.