Air Source heat pumps are electrical appliances and thus have to have an acceptable electrical power supply as a way to do the job. Our ASHP sits on the concrete slab, which is covered with stones. There are actually mounting points throughout the base if the heat pump is bolted https://mysterybookmarks.com/story21005856/how-much-you-need-to-expect-you-ll-pay-for-a-good-air-source-heat-pump-installation