Weather at home is a family quest that is only given if you complete the quest Life-threatening condition.
Simply talking to Anna will result in her giving Carl Stein 400 reputation points. Buying the heater, which costs $2250, will only give the player 50 more reputation points, making it more profitable to not buy the heater. After finishing this quest, talking to Anna again will result in her mentioning that Martha is sick again, and she requires illegal foreign medicine, starting The last jerk. It is best to delay this quest as far as possible to prevent this.