Looking for the best direct-to-consumer mini split for heating in zone 6
I live in Minnesota and am converting my detached garage into a workshop. Approximately 575 sqft, 9 foot ceilings, R13 in walls, R49 in ceiling, insulated garage door with green hinges and draft sealing. Basically, about as insulated and sealed as a garage can get without building from scratch.
I don't really care about cooling capacity, but I'd like to keep the garage in the 50-60F range for most of the winter. This includes weeks of single digit temps. I've estimated I need about 24k but of heating for this, but I'm thinking I may pay for a CoolCalc to get a more confident Manual J calculation to verify.
I've been researching mini splits and have determined that the Blue Ridge XS5 24k BTU appears to have the best cold weather performance and HSPF2 Region V rating among the "direct to consumer" mini splits. Their XS6 18k BTU has great cold weather performance and efficiency as well, but I'm worried it won't have the oomph for deep winter and they don't have a 24k BTU option.
I don't need a DIY option, I'm comfortable renting the equipment to vac the line sets. I have received multiple quotes for this between $8-12k which to me is absolutely obscene. They try to really sell me on the warranty but I can replace a unit 2-3 times over for that price. I'm open to any brand or model that sells directly to consumer and has good support. Alpine Home Air has blown me away with their support so far.