I am interested in a 2 person infrared sauna that is 110v driven and can be placed on a covered outside porch. Temperatures from below zero to 90. What do you suggest

Hello Rita and thank you for your question. Infrared saunas generally do not perform well in those types of cold ambient temperatures. Thermal energy (infrared rays) tend to heat what they contact, so the air in the sauna probably won't be hot enough for comfort, when operating in ambient temperatures below about 65 degrees F.