Nick's Plumbing & Air Conditioning Coupons and Vouchers Check out some of Nick’s Plumbing & Air Conditioning, Coupons and Vouchers to receive great discounts on our plumbing repair services in Houston. Save $463 With VIP Maintenance Plan $40 OFF New Customer DiscountMention this coupon when you schedule, no need to print! 10% OFF Senior Citizen DiscountMention this coupon when you schedule, no need to print! 10% OFF Military DiscountMention this coupon when you schedule, no need to print!