@Adam2384
If allowing this attractive amenity to my guests at no charge would result in a negative cash flow, I'd not offer it. However, long term, this may end up being so wonderful that it would attract more business and thus become a real asset. I'd not charge, and if a guest wanted to use the heater to enjoy the outdoor area all day, that's what it is for, imho. The remedy might be to remove the heaters during the winter, so that guests would either stay indoors or bundle up. We provide unlimited propane to our guests, and the automatic diesel generator comes on when electricity use depletes the ample battery bank. Winter operation is vastly more costly for us (off grid) because of propane use and generator. It is our choice if we want to offer our space to guests in winter, instead of closing down. We limit our own use of heat in winter, wearing more layers and a warm jacket, hat and scarf indoors. We also take short showers, being careful of propane for heating water and generator for pumping the well. We don't think it is fair to require our paying guests to do the same. In summer, guests use the A/C as much as they wish. At times this causes the generator to run, even with full sun for solar. Propane and diesel are nearly $5 a gallon here in rural Northern California, and we fill our multiple tanks at great cost to us. It is just the price of doing business for us. Just a thought, do the math, see what is the cost/benefit analysis.