It does not necessarily mean a whole new system is required, there are many reasons for any central heating system to degrade and we will advise on the best way to get your heating back to its maximum potential quickly. How soon do you require a service? Ratings may be adjusted for the following reasons. Thank you so much for assigning a positive, knowledgeable, and efficient technician for our furnace time-up! he represents everything we love and have grown to expect from holt!.