bacteria and tobacco smoke in the air. The result is a cleaner, healthier environment for all occupants of the household, especially for those who suffer from hay fever or respiratory complaints. What are the Main Warm Air Heating Disadvantages? As warm air systems deteriorate with age they may suffer with an inefficient on and off mechanism Whilst there does appear to be way more  benefits to installing a warm air unit, it is worth considering that they are usually associated with new build housing and that it could work out very expensive to install a system into an older house. How Much Does a Warm Air System Cost to Buy and Install? As a warm system requires ducts to allow the flow of warm air, costs vary dramatically depending on whether your home already has ductwork or not.  Bear in mind that you'll need to hire a qualified heating engineer to install a warm air heating system safely and in line with building regulations. If a home already has air ducts, then installing a warm air system is relatively straightforward and should only take around two days. For a house of around 2,000 square feet you would be looking at costs of around 2,500 though if additional ducts need to be added this cost could easily increase. For a house that needs ducts, such as a house that uses radiators, both the costs and time involved will go up quite considerably. For a 2,000 square feet home there costs would