Put mini split condenser on roof, or mount to side of building?

Hey folks, I’m considering installing some mini splits in my 1920 Ridgewood brick 2 family house. I’m looking to do it myself, and am in early stages of planning. I can pull a vacuum, I know how to operate manifold gauges, work with refrigerant, etc etc.

One thing I am wondering about is where to mount the condensers. I think the easiest way would be to put them up on the roof, but I am expecting to have to replace/recover my roof in a few years. Is having them on the roof going to be an issue, with these future repairs in mind? I was thinking you could have some extra length of hose up there, and have the condensers essentially mounted on wood skids that you can slide around during the roof job and the lag down when they are ready to be securely mounted again, but not sure if this is a good plan. Mounting them on the side of the building would work but obviously be a little more difficult to hold that heavy unit while on a ladder.

If anyone has any advice or thoughts I welcome them. Thanks!

carasgaladhon

in General Discussion 1 year and 5 months ago

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cate | 1 year and 4 months ago

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Newer high rises here likely have central air and many older co-ops may prohibit condensers for individual units. It’s unsightly to mount condensers on the front facade of a row house, although you do sometimes see it. It is even a bit of a challenge to mount them on the rear facade of a row house where all available space is already taken up by hatches, faucets, seating, windows, and doors. In rural areas with freestanding houses, it’s much easier to do unobtrusively without affecting appearance or function.

chemosphere | 1 year and 4 months ago

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what about in the yard?
Why is it that other countries have high rise apartment buildings with facades covered with these? Surely they must deal with maintenance too? Perhaps they use smaller, lighter condensers, and just replace them when they break? But even that requires removing and replacing them through the window.

Guest User | 1 year and 4 months ago

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there is no way that you should expect a technician to lean over the parapet of a building to service a unit… i have been on so many jobs where the boiler, hw heater, air handler, or hvac has been installed in some inaccessible place to maximize floor area ratio or living space… think about lowering future costs by providing clear and easy access to all mechanical equipment

jimhillra | 1 year and 4 months ago

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Steel dunnage on the roof is not necessarily a structural consideration, at least not because the roof cannot support the weight. It probably can. They’re not too heavy. That said, it is a fire safety code requirement. They need to be on non-combustible structure.
If the supports are wood roof joists, during a fire, they will burn and send flaming condensers dropping down onto inhabitants and firemen. That would be bad.

carasgaladhon | 1 year and 4 months ago

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Dumb question but is it possible to mount them to the side of the building, near the roof line, close enough to service the units?

Guest User | 1 year and 5 months ago

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if you can afford the expense for dunnage, the roof… if not ground level… remember these things have to be serviced at some point, and you are making it really expensive in the future if you make them difficult to reach

cate | 1 year and 5 months ago

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I was debating the same question. Eman137, where is the best spot for condensers, in your experience?

justinromeu26 | 1 year and 5 months ago

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Putting mechanicals on roof requires a permit. Fdny permit.

Guest User | 1 year and 5 months ago

string(1) "3"
string(6) "201692"

your roof is not designed to hold mechanicals… you shoud put steel beams across the corner of the parapet (dunnage) to hold the load, or at the very least bolt a cradle to the parapet wall for support … also bolting the unit to the side of the building up high will create a servicing nightmare