Comfort By Design is a highly recommended business that provides excellent service and customer satisfaction. Customers praise the company's friendly and fast response, with technicians arriving promptly and efficiently diagnosing and resolving issues. The workers are described as polite, knowledgeable, and respectful of the customer's home. Clients highlight the company's reasonable prices, professional approach, and high-quality work, whether it's fireplace installation or HVAC maintenance. Comfort By Design has built a loyal customer base, with some clients using the company's services for years. Overall, the business is praised for its prompt, helpful, and professional service.