The wide range of options in heating ventilation and air conditioning systems makes it easier to lose sight of those that make sense in terms of cost and performance. Nevertheless, it does not matter whether one is constructing a new house or enhancing the services in an old house residential home owners or tenants in such housing should always think until they have thought through the installation whenever they invest any amount of money into it particularly with a good expectation of payback in the form of dynamics of needs and performance.