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Those venturi vacuum pumps are not a good way to do it. You would probably burn out a shop compressor running it non stop to use one of them and use a lot of electricity... and they don't pull a vacuum much below 26-27 inches.
They do work good for flushing out brake fluid by sucking it out the brake caliper bleeders. There's no pump oil to get contaminated with brake fluid in the venturi type doing that.
The Robinaire pump I did mention will pull a vacuum to 29" and you can run it all day or night if you want no problem.
I've heard it's best to do it on a hot day... so it might be a good idea to put a fan next to the vacuum pump to help cool the motor on it when running it in the sun on a hot day.
The only thing from Harbor Freight I mentioned were the AC manifold gauges they sell for around $40. I havn't looked at them so I don't know how cheaply made they are, but they would probably be OK for home use.
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