Trouble using Manual J calculator, I could use some help
I have a couple of companies quoting ASHP for my house is Kenora Ontario, Canada (zone 7).
I have not heard back from all yet but would like an accurate manual J done by me or other(s) that have experience using Load-Calc (or another recommended product).
Despite my strongly worded request that the contractors complete a Manual J they are all (3 co’s) using Rule of Thumb calculations: each reacted the same when I told them the size of the existing furnace (80k btu at 75% eff),,, “Sounds about right”. All were alarmed at the Manual J I completed about a year ago at about 30k btu stating to a man that “Doesn’t sound right”.
I expect to be quoted over-sized equipment but could insist on right-sized if I’m confident in the math…One of the companies quoted a PUZ-HA42NHA5 VRF heat pump outdoor unit as well as several other components. I’ve asked them for clarity on the sizing of that unit but suspect its 42k btu given the model number.
I would appreciate being able to ask Questions about that program as I work my way through it…its been a while since I last stumbled through it!
With that in mind I’m struggling through page 2 Windows and doors..
Windows.. I have windows on each of the 4 walls, all different sizes. What I see is an option for only 1 window per side…Do I add up the square footage per side and average them?
More questions to follow…thanks…
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