On The Mark is more than our name and banner . . . It's our mission! We are thorough and exacting with the units we service and the customers that have put their faith in us. Commercial: We keep the equipment running right, so that you can keep your business running right. Keep it On The Mark. Residential: Home comfort is key! Home heating, air conditioning, air filtration, humidification, duct zoning, energy savings and more, Keep it On The Mark. Since 1994, Mark Hanna has remained steadfast to his principals and business ethics. On The Mark Mechanical's success is measured in customer satisfaction and the referrals that are given on our behalf.