Tell us about yourself!
I'm not sure who would go through the hassle of bringing this in and out of their house 100 times a day to reheat it. I imagine all that extra opening of your front door would defeat the purpose too. And i especially have no plans of putting holes through my house to run ducting. For those in the same shoes... I have seen this done before where you just mount the box in a window in your home that gets a lot of sunlight during the day. Even build a couple and put them in different Windows on different sides of the house
The thing to remember is that most landlines still have voltage on them, even when without service. Not everyone has landline service... Ya know?
What diode are you recommending to prevent frying your phone in case a call is received on the landline while charging?