Calvin’s Climate Family Circle After more than 17 years in business, our customers have become an extended family to us. When we see your HVAC systems twice per year, we can head off any potential problems and save you time and headache in the hot summer months. Take advantage of our best pricing and scheduling when you enroll in our Calvin’s Climate Family Care maintenance plans. You’ll save time and money, knowing the maintenance of your systems is in our hands. Download our Maintenance Agreement.