Cooling Fan Line Voltage Thermoswitch I Have A Boat With A Reverse Cycle 110 Heat And Air Unit That There Is No Replacement Thermostat For. Needhelp?

I have a boat with a reverse cycle 110 heat and air unit that there is no replacement thermostat for. Needhelp? - cooling fan line voltage thermoswitch

My thermostat is a thermostat voltage line 110 with the size 14 in white and yellow wire to heat and cool terminals. Com. is a fiber of small caliber. The fan has a high / low with only son of smaller caliber. He has a hot or cold and features a switch from / to a small black wire gauge. Will T6574B3000 Honeywell replacement? I'm not sure what the term fan-coil units in the specifications. Thanks