Ltg I have a electric heater from Amazon ,optimus, I sit outside all day every day regardless of temps,since I retired 10 years ago,granted I am in the south, I have been outside at 5 degrees, I live in a condo on second floor with balcony and roof,but I wear layers, might be worth a look,I sit fairly close to it and rarely turn it to high,Hope it is worth a try for you