I was quoted between 8k and 13k. Settled on a contractor that did it for 10k. That's with rebates applied. You pay the loan back through your electric bill as a separate charge. No money down less than 1% 10k loan? For me financially it was a no brainer considering my second floor had no heating or cooling system when I bought it. It was our first project in the new old house.

You can get whatever brand you like as long as it meets the efficiency requirements and your contractor is on the approved installation list. Mine are westinghouse and they've been good thus far.

I used Eversources financing option and got a loan for less than 1% interest for an energy efficient upgrade. Go to energizect.com and look at what they offer. You can save a lot using that route. I found many contractors there also and got mine installed for 10k last year. 4 headers (3 x 9000 btu and 1x 12000 btu) and 1 condenser at 45000 btus. That's parts and labor. Includes 2 years of annual service as well.

Company spends more money = company charges more money for products. I like the idea, but idk if it would be effective.