@Karen343, that's ridiculous! Are they asking you to put the AC night now or are they suggesting that you should have an AC in your house?
Assuming they want it right now, I know it's impossible and you aren't obliged to get an AC because a guest demands. They are simply bullying you, and that's very unfortunate.
How many members have checked in? 2 or more? If there's more than 2, you can certainly get rid of them immediately because you are offering the place for only 2 guests. If it's just mother and daughter, it should be fine because your place accomodates 2 guests and even if they booked for 1 and ended up coming 2, they should've alteast informed you about it before checking in.
Airbnb policy states that only registered number of guests are allowed to stay.
If you are having too much trouble and you aren't comfirtable hosting them, call Airbnb right now and they shall make alternative arrangements for your guests.
Hope that helps, good luck, let us know what happens,
Jeet