AC questions

My ac guys came today and installed a heat pump on top of an addition. They did it before the roofer roofed. Is this common? Shouldn't they have roofed first? It's going to be metal roof.
They also put in a dryer vent. A box at the bottom, then a straight pipe. They cut a hole in the roof, but one truss over from the pipe. I'm ass-u-ming that they cut the hole in the wrong place, as there's a 3' piece of pipe sitting there on the floor not connected. The top of the vent pipe runs to the top of the top plate. I don't want any flex in there, as it would be a tight flex because it's a slightly sloped roof, and it would take two tight flexes to make it to the hole they cut. Dryer vents are best when a straight shot, right?
Steve

"SteveB" wrote
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Steve,
Sorry, I had to laugh. But, I believe you're not trolling. Could you post up a couple of pictures? I got to see this, to believe it.

On Tue, 30 Oct 2007 18:24:46 -0700, "SteveB"
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If the roofers haven't finished the roof, cut a new hole in the right place and have them fix the "wrong" hole, Back bill the HVAC guy for fixing the roof.

SteveB wrote:
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Hello Steve,
-HVAC, A/C units are required to be secured to the roof. This tends to make holes in the roof. This is not news to the roofers, who will be blamed for any leaks. The roofer may wish to follow the HVAC man on this. It is common practice as far as I know and done. Your local mileage may vary.
BTW, A/C units are not mounted directly on the roof but on racks, etc.
-DRYER, Perhaps the straight shot for the vent to the roof would exhaust the vent in a bad spot. Too close to the A/C, or there may local code issues to consider.
Read your dryers owner manual for allowed dryer vent length. A shorter run is better for the dryer, but we do what we have to. My vent runs 28' with 4 elbows......not ideal but well within manufactures specs.
Why not ask the HVAC man? After all he can see your house.

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Am going to do that today, but have to leave soon for Vegas, then back tomorrow. I'll call him on the phone. I just like to bounce ideas around in here before I ask stupid or obvious questions. In here, people are a little more relaxed. Well, some people, any way.
Steve