I've taken a Hot yoga studio on and I need a thermostat with high heat settings and fan on/auto. Long story short I need the fan settings so I can turn fan on to allow fresh air to purge the room and when they need the heat I need it to be 105. I have an outdoor furnace w/o cooling. I was advised by the manufacturer to not use line voltage stat, but a 24v. My tstat rep says I won't find a stat that goes over 90. Has anyone got any suggestions? Or am I stuck with 120v?