I often wonder, in 20 degree weather, if it heats up enough to condensate.
Hi. Heating up doesn't increase the chance of condensation - cooling down does. Heating up above the freezing point increases the chance of having
liquid water on the electronics, though.
So, if there isn't ice or water on the components before you turn it on, it won't develop because the components heat up. Rule of thumb - if your receiver is covered in frost, there's a risk if you turn it on.
Liquid water is more of a risk because it accelerates corrosion. If liquid water turns to ice in the receiver, that can be an issue depending on where it occurs. For example, liquid water inside of a plastic component that turns to ice will expand and produce stresses inside of the part, possibly cracking and breaking connections. On the other end of things, liquid water inside of a component that heats up can turn to steam and "popcorn" a part, busting it apart.
So, yeah, there's a risk. However, given that it's a POS (your description
), I wouldn't give it a second thought. Just hook it up and enjoy it.