5 deg that might not be good for you.
http://www.greecomfort.com/wp-conten...P230V1B-V0.pdf
The mitsubishi hyper heat might be better for you.
Here is a quote from them
"Our H2i MSZ-FE systems performed at 100 percent rated capacity at 5 degrees Fahrenheit and even produced heat down to minus 18 degrees Fahrenheit."
http://www.mitsubishipro.com/en/prof...s/msz-femuz-fe