Preventative maintenance can help equipment last longer. Diagnostic testing is also available to test the efficiency of heating and cooling systems. My cooling system is functioning at optimum performance and keeping me cool in the summer and warm in the winter. http://www.101industries.com/commercial_services.html
Insulate exterior walls to prevent condensation. In cold climates, insulating basement walls also saves energy and reduces your heating bill. But don't cover the walls with insulation if water is leaking in from outside; you'll just create a potential mold problem.