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Do Heat Pumps need to start up at Full Power?

 
Air Source Heat Pumps (ASHPs)
Last Post by Toodles 2 hours ago
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Toodles
 Toodles
(@toodles)
Illustrious Member Contributor
Joined: 3 years ago
Posts: 2270
Topic starter 16/11/2025 4:24 pm  

When our heat pump starts up, (Daikin EDLA08 8 kW Monobloc controlled via a Homely Smart Controller) the cycle starts with a high power burst and very quickly lowers the power consumption so that within minutes, it is running on ~600 Watts or less. Now the consumption will be greater in cold weather than in mild and, particularly in mild conditions, cycling may well happen.

Thinking about the above start-up procedure, I would be curious to know from anyone knowledgable in such matters, is the high power start-up a requirement for all the mechanical mechanisms to initiate and run efficiently? With smart controllers able to monitor performance and compare OAT, IAT, temperature drop (therefore the heat loss) and probably other factors I have not mentioned, I would imagine that such control might be exerted over the start-up of the cycle to curtail such abrupt surge demands replacing them with ‘soft start-ups’. I may be missing some fundamental law of the physics involved in the compressor mechanism so that what I am suggesting is wholly undesirable or even impossible. However, it does seem to me that if the IAT is constantly monitored and trends indicate a slight drop below required comfort level, a soft-start might be employed and just tick over rather than waiting for a greater drop in comfort level resulting in the need for a greater surge-start to restore the temperature to ‘normal’.

Maybe what I am suggesting would actually be counterproductive and result in more short cycling than ever, rather than a reduction in surge demand and wear and tear, I just don’t know. I ask the question purely out of curiosity really. Whimsically, Toodles.


Toodles, heats his home with cold draughts and cooks food with magnets.


   
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