Specifications include, but are not limited to: The City of Crystal Lake will accept sealed bids for a 24 month HVAC maintenance contract, with two (2) optional one (1) year extensions. The intent of this bid is to obtain the services of a qualified contractor, having experience in the preventive maintenance and repair of commercial and industrial plumbing, heating and air conditioning systems. The contractor will be capable of providing the full spectrum of services consisting of maintenance, repair, and replacement of the heating, ventilating, air conditioning systems, subsystems, and components normally considered as part of an HVAC system, and required for the proper functioning of that system according to standard industry practices and usage. The contractor shall also be capable of providing maintenance, repair and replacement of all plumbing systems, potable water supply, drain, waste and vent piping, water heaters, and drinking fountains