C.A.S. Air Conditioning & Heating

C.A.S. Air Conditioning & Heating has served Collin County since 2002, earning a perfect 5.0-star average across 236 reviews on platforms including Yelp and Angi. The family-owned and operated company holds full licensing, insurance, and bonding as required by Texas regulators. Their service territory includes Plano, Frisco, Allen, McKinney, Prosper, and Celina, where they handle both residential and light commercial projects. Technicians at C.A.S. do not work on commission, a policy that shapes how they approach every diagnosis and repair recommendation.

What distinguishes this contractor is their commitment to transparent pricing and same-day availability within Collin County. The company evaluates properties for energy-efficient upgrades as part of standard service visits, aiming to reduce long-term utility costs for homeowners. Their preventative maintenance agreements are designed to catch developing issues before they escalate into emergency breakdowns. A free estimate is offered on all new installations and replacements, and financing options are available for larger projects. The company handles all major brands and ages of equipment, from legacy systems to the latest smart thermostat integrations.

Reviewers repeatedly highlight technician Josh Marcial by name for his thorough explanations and professional demeanor. Shawn Perry described feeling confident in every decision after Josh walked through all available options without pressure. David Lester called on a backed-up drain on a Sunday and scheduled an appointment for the following day; Josh arrived and resolved the issue without a repeat visit. When Mike Bajema's unit was destroyed by a lightning strike in May 2023, C.A.S. honored the warranty and completed the replacement within 48 hours. Alvin Wu specifically praised owner Chad for his knowledge and integrity, noting that multiple neighbors had already made the same recommendation.