While a lot of HVAC companies fix heating systems of different makes and models, it's important to be sure they have experience with your particular system. Certain brands or system types may be the area of expertise for some businesses. Verifying their credentials, skills, and familiarity with your heating system can guarantee expert repairs. Always ask about their qualifications and, if necessary, get references. Selecting a business that specializes in your specific brand or model might improve the effectiveness and caliber of the repair services offered.