The CleanBC Better Homes and Home Renovation Rebate Program requires that load calculations are performed to qualify for a rebate in dual-fuel heating systems. While CleanBC strongly recommends load calculations be completed for all heat pump installations, at this time, the requirement only applies to air-source heat pump installations that are combined with a natural gas or propane furnace as backup. Please see below for the load calculation requirements for dual-fuel systems.
Load Calculation Requirements
A load calculation is required for all air-source heat pumps in a dual-fuel furnace/heat pump system that are installed on or after November 1, 2018. This is being required to ensure the equipment is sized per program requirements (which helps to ensure program objectives of emission reduction occur) and encourage high-quality installations.
Rule-of-thumb equipment sizing will not be accepted.
Contractors can perform the load calculation by using any of the following options:
- the HRAI Residential Heat Loss & Heat Gain technical manual in combination with the Microsoft Excel-based spreadsheets supplied with the CAN/CSA F280-12 standard
- a software that uses the CAN/CSA F280-12 calculation methodology. Two recommended options are TECA’s Quality First software and Right-F280.
- a software or worksheet that uses the CAN/CSA F280-90 calculation methodology.
- a software or worksheet that uses methodology from Air Conditioning Contractors of America (ACCA) Manual J
- a software or worksheet that uses methodology from TECA’s Quality First Forced Air Guidelines (5thedition 2008)
A copy of the load calculation is part of the required documentation. The load calculation can be documented by a submittal sheet from compliant software or by a load calculation worksheet from TECA, HRAI, ACCA or the CSA F280 standard.
If your contractor is not sure if their current heat load calculation methodology meets these criteria, please have them contact firstname.lastname@example.org.
The Heating, Refrigeration and Air Conditioning Institute of Canada (HRAI) and the Thermal Environment Comfort Association (TECA) both offer training courses on CAN/CSA F280-12 load calculations. HRAI offers a 4-day course in Victoria and Vancouver. TECA is currently updating its Forced Air Guidelines Course with CAN/CSA F280-12 material and will be offering it throughout BC. Both organisations also offer technical manuals on residential heat loss and heat gain load calculations. There are a large number of available software solutions and mobile apps that allow you to do Manual J calculations.