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Frequently Asked Questions
What two questions decide which heat pump suits?
What it takes heat from, and what it delivers into.
Every machine here is one pair of answers.
The source sets the capacity ceiling.
The delivery side decides what can go inside.
The pair matters more than the manufacturer.
Why does an air source lose capacity when it is needed?
Because the source and the demand move together.
Outdoor air gets colder as the building gets colder.
Output falls exactly as demand rises.
Supplementary heat covers the gap at design conditions.
It is free and needs no groundworks, which is the trade.
What does a ground source buy?
A source temperature that barely moves all year.
Output is steady and running cost is predictable.
There is no defrost cycle to lose time to.
The array must be drilled or dug first.
That capital arrives before any heat does.
When does a shared water loop make sense?
When one part of the building rejects what another needs.
A cooled core and an exposed perimeter is the classic case.
Rejected heat becomes a source instead of a loss.
The loop is kept in a moderate temperature band.
Each unit connects to it independently.
Why does flow temperature end retrofits?
Because existing emitters were sized for a hotter flow.
A boiler could reach temperatures a heat pump cannot.
Radiators sized for that flow will underperform.
Either the emitters change or the machine must reach higher.
Capacity is rarely the thing that blocks the job.
What is a hybrid or dual-fuel machine for?
Refusing the choice between two sources.
A heat pump is paired with a combustion appliance.
Control switches between them at a chosen point.
The switch can follow running cost or capacity.
It suits buildings that cannot be fully converted.
Does one of these do both heating and cooling?
All of them reverse, which is the point of the technology.
The same circuit moves heat in either direction.
What varies is the medium at each end.
Air-to-water machines usually serve heating and hot water.
Air-to-air machines are commonly used for both.