Put it on a timer if you're worried.

The mini rose needs no heat. They are just as hardy as garden roses. Indeed they are much happier outside than in.

Personally, I should think that if you can bear the temperature in your home, the plants certainly can.

The phalaenopsis orchid will definitely take any temp you can handle in the house. In fact, a cool down at this time of year helps trigger flowering. I would not use a heating pad under it. Can you post pix of your succulent and "another plant"? They may not need nor benefit from heat either.

tj

The succulent is a haworthia (or a haw-aloe hybrid) and will be fine without heat. I can't make out the plant that won't die. I'd say if you are trying to root the lemon balm and pineapple those would be the only two that could benefit from more heat. I'd remove the others from that pad.

tj