I used Tesla. I paired the solar with 4 power walls, so my purchase price isn't really comparable. You can go on their website and get a quote really quickly. Good products, but their project management left something to be desired. At the time, they guaranteed the lowest price.

I’d actually go air source heat pump (mini split) if I did it over again. The geo is great, but the payback period is a lot longer. The coefficient of performance is only slightly better on geo vs air source (4 vs 3).

A little under 3000 sq ft. My heat pump is a 5 ton IIRC.

16 kw. It isn't enough, but it will still pay for itself in a few years. I'd like to add more panels at some point.

I think I did the federal tax credit for both chargers. I didn't know that CT had a rebate. As a side note, I still wholeheartedly recommend an EV if you can afford one. The lack of routine maintenance is great. Wiper blades, washer fluid, and tires are about it.

I have two EVs (Tesla model 3 and Y), and my house is all electric (geothermal, induction, heat pump water heater). I was lucky and managed the switch to Constellation before their rates went up significantly. My last bill was around $600 (which still beats the heck out of what I was paying for oil, gasoline, and electric for the house). Given, last year, my Jan bill was closer to 1k. It has been so mild this winter that I haven't even run aux heat to keep my house warm.

For my EV, I use around 400 kWh per month to keep it charged up. If you're on Eversource's new rates, you would pay $140 to charge the car to drive around 1100 miles. Pretty on par with an efficient gas car (30 mpg average). If you were going EV, I'd urge you to consider getting solar. I don't pay anything for over half the year.