The mini split is an heat pump which is very energy efficient. Adding a mini split to our enclosed lanai actually dropped the price of our electric bill compared to having our main hvac system try to heat and cool our lanai.
Also, throw away the cheap remote that you control the mini split and get a real thermostat that you can program, like the newer ecobee or nest thermostats used in your home. They cost $100 on sale and I put mine in the 1st day I got the mini installed
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