A/C & Furnace Maintenance Minimum maintenance is yearly cleaning and service by a licensed HVAC technician to help prevent unexpected, costly repairs. The roofline has a PVC pipe sticking out of the eve.  This pipe is the emergency overflow for the A/C.  Water running or dripping usually indicates that the main drain is clogged.  The suggestion is to call for HVAC service immediately to try to prevent the pan from overflowing onto the ceiling board, which would result in costly repairs.  To help keep the overflow line clear, pour 1/2 cup of chlorine bleach in the pan twice a year. Water Heater Maintenance A gas or electric water heater is the most dangerous appliance in a home.  Once a month, the temperature and pressure relief valve should be checked.  If the water can be heard coursing through the pressure relief valve, it is functioning properly.  If water can not be heard, the pressure relief valve should be replaced. Both the water and gas should be turned off twice a year to gravity drain the system to help prevent sediment and water impurities from attacking the internal components of the water heater. Foundation Maintenance In the Houston area, most slab-on-grade foundations are built on very cohesive clay soil.  In the summer this soil contracts, creating voids under the foundation.  To help prevent soil contracting, the slab should be properly watered.  A suggested  technique is to lay a soaker hose 12-18 inches from the slab.  If you prefer, attach timers to the faucets to which the hoses are attached.  During the dry parts of the summer, water approximately 15 minutes a day for three to four times a week.  Remember ... spending 20-30 dollars a month for watering is less expensive than paying for potentially costly foundation repairs.  Cracked Corners of Foundations Most slab-on-grade foundations will crack within six to ten inches of the corners of the foundation.  This is a normal occurrence.  These cracks generally occur because these areas do not have reinforcement.  The concern regarding these cracks is that they usually run down to the grade or soil level, creating a viable entry point for wood destroying insects.  The suggestion is to seal the cracks with a mortar patch.  (A mortar patch can also be used on hairline cracks in brick veneer walls caused by minor settlement.)  Maintain three to six inches of slab exposure to deter wood destroying insects.   We hope you find these tips helpful to you in your new home... ENJOY!!!