Multi-zone minisplit installation time
I’m hoping to get some feedback on an install time estimate I recently received from an HVAC contractor. Here’s the background:
We are building a 3,300 sqft 2 1/2 story house in Southern NH (Climate Zone 5A) that will be well insulated, simple shaped, & tight. There will also be a 1,100 sqft attached guest house/future in-law suite that we may or may not finish now, but are planning our HVAC around. I ran all the head load calculations myself and have ready through endless submittal sheets for Mitsubishi & Fujitsu and proposed the full design myself. Having met with the contractor, he agrees the load calculations are good & the system will work well for the house.
1st Floor (open concept) – PLA-A12EA7 ceiling cassette
2nd & 3rd Floor – PEAD-A12AA7 ducted with short runs to bedrooms
Guest house/in-law suite – PLA-A12EA7 ceiling cassette
Outdoor condenser – MXZ-3c36NAHZ
There’s nothing particularly complicated about the install and I will be handling all the ductwork myself. Given that it’s all open construction and centrally located with short (<25′) lines, I expected it to be just under 1 day of work for 2 installers. The estimate for labor came to 120 hours. Profit, overhead, & materials are spelled out separately, so the labor estimate should be purely labor. I’ll be meeting with him in a week or two to talk through the labor breakdown, but I’m hoping to get a sense here if I’m completely off my rocker and the 120 is completely normal or if this is worth digging into more with the contractor.
I will also note, that he has been completely professional through the whole process, immediately suggested a manual J (before knowing I had done this already), and his cost breakdown is done in a way that seems both transparent and fair to me. If the number wasn’t so dramatically different than what I was expecting, I would feel no compulsion to dig into it any further.
Does anyone have thoughts around what might be contributing to 120 hours worth of work that excludes system design, load calculations, & ductwork?
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