Thermostat Limited to 73, Tenant Complaining Too Cold!

[Sunny Burns]

We have a nest thermostat,which is awesome because you can limit it to whatever temperature you want. Currently I have it locked so it can go no higher than 73 degrees. In my own home I do not ever set it higher than 68. By law in NJ if the landlord has control of the thermostat you must keep the heat to at least 68 degrees from 6am-11pm and 65 degrees at all other times. So I think 73 is more than reasonable. I received the following text last night, how would you other landlords respond? I want to keep the tenant happy, but if I raise it any more I feel upstairs unit will complain that it is too hot, I also want to keep the Natural Gas costs to a reasonable level.