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Frequently Asked Questions
What does putting the pump outside solve?
Nothing indoors gets colder.
The chilled air goes to the garden.
So the cylinder can sit anywhere.
A heated cupboard or a plant room.
With no minimum room volume.
When is that the only option?
In a house with no suitable room.
No garage, basement or large utility.
An integrated unit needs one of those.
Or ducting to somewhere that qualifies.
A split unit needs neither.
Does the noise go outside too?
Yes, which is usually better.
And occasionally worse.
An outdoor compressor near a window.
Is a neighbour's problem, not yours.
Site it for that, not only for pipe runs.
How much does the refrigerant circuit add?
A second trade, effectively.
Insulated lines between the two units.
Evacuated and charged on commissioning.
Which in most markets is restricted work.
A plumber cannot complete it alone.
How does cold weather affect it?
Output falls as ambient falls.
Exactly when demand is rising.
An indoor unit in a garage does not.
Its air stays above freezing.
That is the real trade between them.
What figure should I ask for?
Performance at low ambient.
Not at the rating point.
Models differ most in the cold.
And the rating point hides it.
Ask for the curve, or the cold figure.
Is pipe run length a constraint?
Yes, and it is stated by the maker.
Both maximum length and height difference.
Which limits where the two can sit.
Relative to each other.
Check it before choosing positions.