If your was built before 1978 and you have children under the age of seven, you will want to have an inspection for lead-based paint. It's important to know that lead flakes from paint can be present in both the home and in the soil surrounding the house. The problem can be fixed temporarily by repairing damaged paint surfaces or planting grass over effected soil. Hiring a lead abatement contractor to remove paint chips and seal damaged areas will fix the problem permanently.
Be sure the thermostat is set in the cooling mode. Just setting the dial below room temperature will not activate the air conditioning if it is set in the heat mode.