Q. What's the downside to some heat pump? The largest draw back to the heat pump is the fact set up could be challenging or pricey. If you’re an experienced DIYer purchasing a pump with an extensive set up kit, you may be fine. Absorption heat pumps use thermal compressors https://purethermal.co.uk/media-news/can-gas-absorption-heat-pumps-provide-an-alternative-heat-pump-option-in-2025/