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Old 10-09-2008, 11:27 PM
 
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Why do they put a/c on the roof here in Vegas? why not on the ground?
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Old 10-09-2008, 11:28 PM
 
Location: ɐpɐʌǝu 'sɐƃǝʌ sɐl
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They do both. The house we're renting now has it on the roof, but the house we were in last year had it on the side of the house.

It might have something to do with the age - this house was built in the 80s, while the other one was built in 2005.

/shrug
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Old 10-09-2008, 11:36 PM
 
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Yes, the older homes have the roof top, which is more expensive to replace. They can put one on the ground, I believe, but it is very costly to do that.
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Old 10-09-2008, 11:46 PM
 
302 posts, read 806,163 times
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Quote:
Originally Posted by BUGBULLY View Post
Yes, the older homes have the roof top, which is more expensive to replace. They can put one on the ground, I believe, but it is very costly to do that.
why is it very costly to do that?
which one is cheaper ? On the roof or on the ground?
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Old 10-09-2008, 11:59 PM
 
Location: NW Las Vegas - Lone Mountain
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There are a number of variables. We for instance live in an all electric home. We have two roof mounted heat pumps. Cheapest and easiest way to build an all electric.

Another version is to do the same thing with a ground mounted condenser. In general ground mounted are a little more efficient as the whole unit is not exposed to direct sun and the condenser is shaded a good part of the day. Howner you now need a separate enclosure for the condenser and a relatively long pair of freon lines from the condenser to the attic mounted unit.

Next you have gas furnaces combined with the AC unit. Now the interior unit is located in the garage or attic...Attic is smaller less expensive...garage in larger and more expensive homes. Condenser is generally mounted along side the house ideally on the shady side.

That is most of them though there are condo variants where the heat comes from pumping the hot water from the hot water tank through a heat exchanger in the duct work.
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Old 10-10-2008, 12:10 AM
 
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Quote:
Originally Posted by KD Hawaii View Post
why is it very costly to do that?
which one is cheaper ? On the roof or on the ground?
They have to redo most everything, because it will be coming from a different direction.

It is about $2000 to $4000 to replace the ground one, depends on what seer and efficiency you want. The roof top is +$5000. The roof top involves a lot more work to replace it. You also need a crane to take down the old and install the new one.
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Old 10-10-2008, 01:48 AM
 
Location: Las Vegas, Nevada
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It isn't the age of the house. Most of the houses I've lived in have had it on the roof. This house has two on the roof and it was built in 2001. It really didn't need to have two but I'm glad it does. My last house had it on the side and it was built in 1989. That house was a two story with one A/C which was not adequate for the second story.
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Old 10-17-2008, 11:11 PM
 
Location: Las Vegas
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Olecapt described it pretty well. I do heating and a/c changeouts on the side and I have to say I prefer rooftop units, they are also cheaper to install than the split systems.

The problem I have with split systems is they always seem to leak freon and if the installing contractors dont properly braze the lines, evacuate the system and add the correct charge, then you end up with a junk system.
Rooftop units are completely assembled at the factory, properly.

I also prefer heat pumps to gas heat, I removed the rooftop gas unit off of my house and installed a heat pump in its place.

Split systems do come in higher efficiencies then package units but with high efficiency also comes a more complicated and sometimes more expensive unit to repair.
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Old 10-17-2008, 11:15 PM
 
Location: Las Vegas
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It used to be with a split system, if you had to replace just the outside unit, you could.

Now that the new units come in a 13 seer minimum efficiency, you must also change the inside coil on the furnace to match the new outdoor unit, this could get really pricey.
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