High-school sweethearts David and Kassie Estrada turned their marriage into a merger of business savvy when they founded A/C Solutions, Inc. together 18 years ago. While Kassie balanced office work with motherhood, David strapped a ladder to the roof of the family minivan and rode to the rescue of ailing air conditioners and sweltering clients. Today, their staff of experienced techs shoulders the grunt work, performing 15-point checkups, repairs, and installations. When repairing any make or model of air conditioner, they charge by the job—not by the hour—to avoid startling clients with bloated invoices.