If you want to invest in a new HVAC system to replace your old one, you might’ve been thinking of buying one at a big box store in your area. After all, it makes sense to go to a place where all your home improvement needs can be met at once. Keep in mind, however, that these retail stores are focused on sales, not service. Even if they do provide services, they won’t be on par with what you can expect from a local HVAC company.