To get around this, you may need to get a special instrumentation agreement with your local power company. Many states and localities require this. You should investigate requirements early. In most states, anything you hook up to the electric needs to be UL approved - Dennis has never produced a product that has earned this. What are special safety considerations.
Any equipment involving energy has a chance to fry building or kill people.
If it has special refrigerants, you'll need to post bond and get special servicing equipment and pass stringent tests to charge and service it. They won't deal with you unless you have some kind of guarantee and service agreement. You also need to protect yourself against possible lawsuits from customers or injury liability from any of your service people who get electrocuted, blown up or what ever. You can always contract out for all these things, but that would eat into your profit margin. I recommend trying to do everything out of your house for as long as possible.