Any large building is going to experience concerns with heating in addition to cooling at some point. If a building is older, it is prone to more concerns than a newer building might be. This is the case with the restaurant I toil in. The building is 60 years old in addition to 5,000 square feet. The temperature in one area of the building can be seriously different in another area at any time. There are several temperature controls that control each unit. In order to keep the heating in addition to cooling system in toiling order, it is vital that my buddy and I keep up with a maintenance plan. It is common for an Heating in addition to A/C maintenance worker to come in to the restaurant once a month, then usually, the Heating in addition to A/C worker will arrive in the day to check out all of the units for any concerns. If they find something that needs to be repaired, they will come back the following day as not to be in the way during the dinner rush. There have been several instances where the Heating in addition to A/C worker will find a small problem in addition to then after further investigation, finds out that the problem is much greater in addition to involved. There was one time where the Heating in addition to A/C worker came in for weekly preventive maintenance in addition to found a undoubtedly bad problem. My great friend and I had to close the restaurant for 3 afternoons while the units on the roof were replaced, then everyone on the staff was undoubtedly frustrated about this, as they were not able to make money while the repairs were taking place.