HCA: Hermit Crab Association

Hello! I am about to install a heater and I just realized, where should I put my crabs while it happens. I do not know how much the heater will raise the temp, so I want to adjust the thermostat so it works well and I can leave it alone. I think I might take my crabs out of the tank just in case something goes wrong. I don’t know where to put them though. Where should I put my crabs while I install the heater? Thank you!

It would probably be easier to just install the heater on a weekend, or when you have a couple of days that you can keep a close eye on the temp in the tank.