Add boolean that calls service to climate / radiotherm

Hello all, just getting started with Home assistant and was hoping someone could point me in the right direction on how to implement this. I have a radiotherm ct50 and it works great with home assistant. I looked at the API and there are a few more functions that i would like to call. I copied the radiotherm over to custom_components and thought i would add the calls there? To start with I would like to turn the thermostat night light on. Should i modify/create new? the climate card to include a boolean or pulldown to do this? Any help would be appreciated, going through documentation now to better understand the overall architecture.