Notes: As you know, we often experience mild summers or winters where additional advertising may be needed to provide work during these normally busy times. Based on the theme of mild weather and lower than normal demand, you may wish to create custom ads based on needs. It's possible to successfully advertise heating and air conditioning as a package. This concept enables you to sell cooling equipment in the winter and heating equipment during the summer. Based on the value of developing a "customer for life", generating tune-ups can prove to be some of the most valuable advertising you can do for your company.