I don't have the time or mental capacity to learn everything on my own- I own a insurance agency and work more than full time. 

Depends - In Portland the capacity has doubled in the past 5 years. 

We turn people away due to being at capacity while most others struggle to hit 40%, and some of those are in more desirable locations.

Cost is regional but we paid about 10 k  for  two units of 5 ton total capacity with heat pump in Phoenix area. 

I’ve been involved in the construction industry ever since I was young wether I was helping a family friend here and there or swinging a hammer full time I have always been around real estate in some capacity.

Moving away from W2 Wage to self employment tends to throw you into a two year wait period before banks will give income credit towards capacity  with the new venture.

Make sure that the person referring them has used them in the same capacity as you would like to use them.

Real estate agents are essentially practicing law (in a very limited capacity) and most people wouldn’t represent themselves in legal matters.

Few additional questions related to this:1) Does one run into issues related to capacity of hot water by having a common hot water heater- where one resident uses more hot water than other and another resident running out of hot water?

If you’re thinking about buying a house with a well, ask when and how it was constructed, how often it’s maintained, if any problems have been found and how they were addressed, and what the well’s capacity is.