I'm an hvac contractor from Oklahoma. My advice is use them for cooling and find a 95% efficient gas furnace or heater and go that route. A 100' of 1/2" or 5/8" gas line and an hour or so with a trencher will be $$$$ better spent in the long run.
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Yes they are called package units. Like was said, heat pump or a/c with either gas or electric heat. They are generally manufactured in the "standard" efficiency grade and not high efficiency. Do not use your existing system. If you install a new 13 seer, seasonal energy efficiency ratio, heat...
I'm in central Oklahoma as just bought two loads of 11/2" crusher run and one load of screenings for $350/ load. Each load was approx. 25 tons.
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If you value your health then by all means ground the black iron pipe. Go to your local electrical wholesaler or maybe a hardware store. You will be a 3/4" bonding clamp. She only copper wire. Ground with you air compressors ground will be ok or to the compressor motor base.
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