@brie They will assess everything to do with insulation and then see where you can improve and/or whether what you have already is adequate. They checked roof in, wall insulation, floor insulation, you name it. Now, it’s not always possible…   Read more»

@brie As others have said, the key to the air source heat pump is insulation. It doesn’t matter how old or new the house is, they just want to see that the house is as insulated as it can be…   Read more»