One of the most frequently asked questions about an Air Source Heat Pump is whether it is able to heat your home properly, how do you know if you have the right size?
As an auditor we do some calculations to make sure it is capable of heating the property and that it won’t have to run all the time to be able to do so but can you check yourself?
There are two very easy calculations you can make to check.
Estimated annual load factor (%) = [Estimated MCS annual generation / (8760 x installation heat capacity (kW))] x 100
This should be between 10-30%, if it is any higher then is may have to work harder than necessary to provide the required heat.
MCS to EPC ratio (%) = (MCS annual generation/EPC heat demand) x 100 (%)
If this is above 90% then the ASHP is capable of supplying all of the heat demand but if it is over 150% then it may be oversized.
All the numbers you need for the calculations can be found on your EPC and MCS Certificate.
