Will work very well at room temperatures from 70-90 F, because the internal temperature is almost 200F the moist vapor will still condense very nicely in 90F weather.

Yes it is not efficient [ operating cost wise ] to run an air-cooled condensing dryer in the house with the central A/C running, but running a FD FT dryer out on the screened porch on a 90F day should work really well.

John L.

Room temperature does not effect drying times on these dryers at all, Yes if it is run in a cooler room they may condense more of the moisture that is being forced out of the clothing by the electric heaters, but the hot moist air will be forced out in any case.

In fact these dryers will dry faster in a 90 F room, these dryers operate by heating the damp tumbling clothing forcing the moisture in the clothing to become steam [ just like a vented dryer ] But these FDFDs do not have a sealed air system, they force about 5 CF of air a minute through the tumbling clothing and out through the condenser.

In the best of cases these dryers only condense about 50% of the water leaving the clothing, the rest is just released into the room.

If the room temperature is higher, say 90F or even more they still force the same amount of moist air out of the load of tumbling clothing so drying times are not affected at all.

However most air-cooled condensing dryers built around the world including FDs 1962-1967 models have a  more tightly sealed air circulation inside the tumbling clothing  and these style dryers probably will slow down in warmer rooms, However in my long experience working with appliances I have never heard anyone say ACCDs slow down in warm weather so I would guess the effect on drying speed is very minimal.

John L.