1.) Have air conditioning units properly maintained and cleaned. Be sure to clean or change the filter monthly.
2.) When landscaping, be sure all water flows rapidly away from your house. Fill in any settlement around the foundation, septic system, utility trenches, bilco door.
3.) Check the spouting runoffs to make sure they are open and marked and that water can easily run out.
4.) If you have a treated deck, remember to seal it annually with a product such as Cuprinol.
5.) New home basements are typically damp from the moisture in the concrete so be sure to always run the dehumidifier and try to keep the temperature around 67 degrees. You can also close windows and doors on hot, humid days and open them on cool, dry days.