Comfort Systems Heating & A/C was established in 2005 with electrical services being added in 2012. CSI is locally owned, licensed, and insured and has been serving Gillette and surrounding areas for over 10 years. CSI has 50 plus years of experience and offers residential and commercial services as well as some industrial. CSI demonstrates the value of custom design based upon individual needs and has 24-hour service, 7 days a week. Whether you are building a house or need service work, CSI will provide you with quality work and satisfaction guaranteed. Our trained and certified electricians and HVAC technicians will provide comfort for your home and work.