You and your family have just rented an apartment and one or two problems occurred. Write a letter to the landlord. Describe the problems and tell him what you want him to do.

Dear Mr. Smith, I am writing with regard to the apartment that we recently rented from you located in Northtown Avenue. The first problem is related to heating system. Since our contract has been started in summer, it was not an issue, but now autumn is coming and the weather is going to be cold. […]