Hi all, new here! I am in the process of getting quotes for a retrofit. I have seen 3 installers, with a 4th coming tomorrow and expect to get several quotes in early next week. However, no one has offered to do a Manual J load calc. Is this calculation something I should ask them to do? I am replacing a 4 ton heat pump and I tell them that it has kept us comfortable. (Though, now that I am thinking of it, it does kick on the electric heat during those colder days/nights.) They ask about square footage (2500 sq ft) and agree that 4 ton is accurate. We have lived here for about a year. Though I don't know the history of the house, I think the builder must have installed a 3 ton unit (about 20 years ago) because the return vent has to be enlarged. The existing heat pump system is 9 years old, so I assume they upgraded because the 3 ton wasn't cutting it in the summer. Thanks!