Plan heating around the building and site
For an El Dorado Hills heat-pump proposal, record the existing fuel, number of zones and any difficulty maintaining heat during colder conditions. Capacity retention and minimum operating temperature are different specifications and should not be treated as interchangeable.
Where multiple systems serve the property, ask for a separate evaluation of each. Replacing one unit should include its actual indoor pairing and controls rather than assuming every system should be sized or configured alike.
For commercial split systems, bring multi-system heating performance into the scope discussion. Ask whether a partial replacement is approved and practical for the existing equipment. Compare it with a complete matched option using serviceability and total scope, not only the cost of the failed component.
