Are greiner hvac systems any good? John. A, Sacramento, CA The quality of a new heating and air conditioning system is not based on the equipment that comes inside of the cardboard boxes - it is based on the people who sell it, install it and service it. So there is no higher quality system than the one that comes from Greiner.How can i contact grainger for help? Check out popular help topics or call, email or chat with us. We're standing by and ready to help! Feedback How can I contact Grainger? Call 1-800-GRAINGER (1-800-472-4643)Why choose a greiner chair? Practical functionality, uncompromising safety and flexible adjustability of the doctor-patient positioning are distinguishing features of all ENT chairs in the GREINER range and ensure the greatest possible well-being for the patient.