Can this be used to keep a work shop around 40 degrees to prevent freezing? What's the average actual amp draw?

Thank you for your question. This unit can efficiently heat with outdoor temperatures as low as 5 degrees Fahrenheit. The indoor unit has a minimum heating operation of 44.6 degrees Fahrenheit and a maximum heating operation temperature of 80.6 Fahrenheit. The outdoor condenser of this system has a max fuse of 20A 230V. For more information relating to this system's operating temperatures, please review page 20 of the User Manual. For more information regarding the electrical specifications, please review the User Manual. The User Manual can be found on the product page at the bottom of the specifications chart, in the resources section. For more assistance, please give use a call.