Our current project features underfloor heating, an open plan area of approximately 120 m2. We have 120mm Celotex in roof, 140mm in walls and 100mm between concrete slab and screed, so it' a well-insulated structure.
We have the space to install a ground source heat pump (GSHP), but not quite the budget. We are considering an air source heat pump (ASHP) instead, but seen quite mixed reviews of both types of pump.
With this amount of insulation, is it worth going for GSHP or is ASHP a more cost effective method? In light of the system maybe not needing to be running all the time, which one is better for us?
Happy to consider other options, but there is no gas on site - only electricity.