Aaron, I’ve had good luck with Mitsubishi mini splits. I think most of the major mini split companies offer good products, but I’ve heard of Trane rebadging splits made by someone else that perhaps aren’t top of the line as one typically associates with traditional Trane air handlers/furnaces. I don’t have personal experience with them, so that might just be bogus talk I’ve heard. The higher SEER units are getting insanely energy efficient and actually offer 100% heating capacity at super cold temps, but can get pricey. I don’t have any experience with the diy Mr Cool that Jim mentioned, but these look like pretty neat solutions at significant savings.