jpm995,
This is our first year with these two electric heaters after my other heaters purchased at a Big Box store went out after 6 years of colder than normal weather. This year we have only had a week of
really cold 20s degree. But we are about to get cold again, so I'll kick the heaters up after turning them off for a week during the day and the doors are open. Our electric bill is divided into 12 equal payments, and it's been around $230 a month. We also have a brand-new heat pump so our cost for heating the house really dropped this last year. We live in the valley floor with mountains around us, so our weather is mild here. We also double tarp both greenhouses to help keep the heat in besides using 20 MIL on the brug house and it's up under the eaves on the shed in a protective area. I try to cut the cost for my addiction wherever I can. Hope this helps.
Have a little more time to add to this. Hunter was the Big Box store heater; it didn't have all the bells and whistles that the Lasko have and much smaller. Lasko can be found at Walmart, there are several varieties so read the boxes. This wasn't my first choice, but they didn't have the one I wanted.