I believe anything can be done, but I checked the website pretty well and I don't see anything that even suggests the use of an external temp sensor at all. Normally I go with the manufacturer when there is a question. this unit shows that it should be professionally installed, did you have someone install it or did you do it yourself? if you had it installed, maybe you could contact the person who installed it and see if they have ever installed an external temp. sensor. If this unit is properly placed you really shouldn't need one.
Answers & Comments
I believe anything can be done, but I checked the website pretty well and I don't see anything that even suggests the use of an external temp sensor at all. Normally I go with the manufacturer when there is a question. this unit shows that it should be professionally installed, did you have someone install it or did you do it yourself? if you had it installed, maybe you could contact the person who installed it and see if they have ever installed an external temp. sensor. If this unit is properly placed you really shouldn't need one.