The heating and air condition has to be functioning properly for the time you are at home. You will feel the most uncomfortable if the environment is cold in the cold season and hot and stuffy in the summer months.
The system should be properly serviced regularly so that the system is in perfect condition when you are ready to take your break and be at home to enjoy some rest or sleep. The appliance can face some problems but if there is a regular servicing then you will find the device working far better than any other that is not serviced regularly.
The companies that are working for providing such maintenance will be good for providing the service to you. You may find any such good company to sign the contract with them so that the HVAC machine never is repaired by any technician who does not feel responsible for it.
The yearly contract of the heating and air conditioning system may get damaged or need some repair but that will be the responsibility of the company that has the annual contract and the integrity of the machine remains intact. You will also have to buy the machine from a good and reputed company and most of the time you will find the company is interested in taking out a yearly service contract.
You must find a good heating and air conditioning company such as United Plumbing Heating Air & Electric, so that the system that they provide you with will never end up not working and if it does the company can come over and take care of the issues by bringing the appliance back to perfect performing condition.
You can check online about the company from where you are going to buy the apparatus and you can talk to the customers who are using such a system from the same company and then you can get the real scenario and decide about buying the a Heating and Air Conditioning.