We all know that maintaining your heating and air conditioning systems should keep them working for longer but just how do you go about it? You should engage the services of an expert, such as a contractor who specializes in HVAC systems. So what would you expect him or her to check?He or she should check all the electrical components of the system to make sure they remain within the code requirements. He may need to tighten the electrical connections in order to keep the system running efficiently.He should test the operation of the thermostat to make sure it is working. Your home temperature may not be the same as the reading on the thermostat which could cause higher energy bills. He may suggest that you put in a programmable thermostat as in most cases they can save families quite a lot of money. They are not suitable for all heating and air conditioning systems though.He should clean all the component parts of the system and lubricate where necessary. He should check the air filters, replacing those that need it and giving you instructions on when you next need to make some changes. He may advise you on how best to upgrade your current system or whether it is time to think about installing a totally new system. He should be able to explain what grants or other incentives are available and although he cannot guarantee you will qualify, he should be able to recommend you to someone who can help.He should check the controls of the system to make sure it is starting and stopping properly. He should measure the airflow in the system as poor quality airflow is usually the main reason why people are unhappy with their heating and air conditioning systems. It may seem like a lot of work but if he is an expert it won’t take very long and will keep your system working at optimum levels.