High Definition MWIR Cameras

We have a 220-year-old stone house with 3ft rubble-filled walls & have had exactly the same experience as you with 3 separate heat pump companies;...

The companies vying to sell me a heat pump will happily give me a COP for the the kit they sell. Only problem is they think that's an efficiency...

Hello Gordoun, you can use a simple empirical formula to estimate COP (my own analysis, unpublished, based on the Building Research Establishment...