They have been doing yearly maintenance on my Furnace, A/C and Gas Fireplace for 5 years now. Excellent service. Ferdinand just did a very thorough job, cleaned and vacuumed all units. They installed my A/C unit 4 years ago when most providers in the area couldn't deal with my furnace and duct work being located in a crawl space. When my furnace fan died after 20+ days of -20 temperature last winter they had to remove the fan housing in my crawl space to take it to their shop to get the seized up fan out to be replaced, Tough job, well done.