Heating, Ventilation and Air Conditioning Services (HVAC) is responsible for the maintenance and repair of all building heating and cooling systems.  Preventive maintenance provides for the routine inspection, care, and lubrication of the HVAC equipment.

The following are examples of services provided by our HVAC Technicians that are generally not chargeable to the requesting department:

  • Adjust air flow to particular areas
  • Control air flows: repair and replace air handlers, exhaust fans and hoods
  • Control temperatures
  • Establish/check for proper fresh air mix
  • Insulate pipes and make insulation repairs
  • Maintain and repair evaporative coolers and air conditioning systems.
  • Maintain diesel-fuel generators
  • Maintain mechanical equipment.
  • Maintain vacuum pumps integral to the building operating system
  • Modify scheduled run times for air conditioning
  • Perform preventive maintenance on heating, ventilation, and air conditioning systems and related equipment
  • Repair and maintain building heating, ventilation and air conditioning systems
  • Repair fume hoods
  • Repair/replace existing temperature control equipment
  • Replace air conditioning filters in buildings.

Services that are usually charged to the requesting department include:

  • Install new controls in remodeled spaces
  • Perform remodeling/renovations
  • Repair special refrigeration equipment

Please do not contact our HVAC Technicians directly:  Questions, please contact the Facilities Office at extension 2629, Monday through Friday, from 7:00 a.m. to 4:30 p.m.

  • To request new work, (this is a chargeable service) and/or repairs,  please submit your work order via email to  Facilities Remedy.
  • If this is an emergency, please contact the Facilities Office, at extension 2629, immediately.

State Policy directs that State Buildings will not be heated above 68 degrees during the winter and 78 degrees during the summer, except in areas where more stringent temperature control is required by law or specialized needs of equipment or experimentation. 

Nature of Work:

Heating and air-conditioning systems control the temperature, humidity, and the total air quality in residential, commercial, industrial, and other buildings.  Heating, air-conditioning, and refrigeration mechanics and installers—also called technicians—install, maintain and repair such systems.  Because heating, ventilation, air-conditioning, and refrigeration systems often are referred to as HVACR systems, these workers also may be called HVACR technicians.

Heating, air-conditioning, and refrigeration systems consist of many mechanical, electrical, and electronic components, such as motors, compressors, pumps, fans, ducts, pipes, thermostats, and switches.  In central forced air heating systems, for example, a furnace heats air, which is then distributed through a system of metal or fiberglass ducts.  Technicians maintain, diagnose, and correct problems throughout the entire system.  To do this, they adjust system controls to recommended settings and test the performance of the system using special tools and test equipment.

Technicians often specialize in either installation or maintenance and repair, although they are trained to do both.  They also may specialize in doing heating work or air-conditioning or refrigeration work.

Technicians follow blueprints or other specifications to install oil, gas, electric, solid-fuel, and multiple-fuel heating systems and air conditioning systems.  After putting the equipment in place, they install fuel and water supply lines, air ducts and vents, pumps, and other components.  They may connect electrical wiring and controls and check the unit for proper operation.

Technicians also install and maintain heat pumps, which are similar to air conditioners but can be reversed so that they both heat and cool.

Heating, air-conditioning, and refrigeration mechanics and installers are adept at using a variety of tools to work with refrigerant lines and air ducts, including hammers, wrenches, metal snips, electric drills, pipe cutters and benders, measurement gauges, and acetylene torches.  They use voltmeters, thermometers, pressure gauges, manometers, and other testing devices to check airflow, refrigerant pressure, electrical circuits, burners, and other components.

Heating and Cooling Controls:

MD Building Classrooms

Every classroom in the MD Building has one of these controllers (see below) on the wall. This controller will give you the ability to fine tune the classroom air temperature more to your liking. The temperature settings are 68 degrees for heating and 74 degrees for cooling when the indicator on the controller dial is at the 12 o’clock position. This means that if the room temperature drops below 68, the heating will activate. If the room temperature rises above 74, the cooling will activate. The air flow to the classroom never stops during hours of operation so there will always be fresh air coming in even if the heating or cooling is not activated. When the dials is turned clockwise the set points will be raised. When the dial is turned counter clockwise the set points will be lowered. The set points can be raised or lowered two (2) degrees + or -.

EXAMPLE: The dial is turned all the way clockwise. The set points change from (68 / 74) to (70 / 76). If the dial is turned halfway counter clockwise the set points change from (68 / 74) to (67 / 73). If the room temperature is not to your liking check the setting on the controller. It may have been changed by the occupants before you.


When any of the classroom windows are open, the heating and cooling is shut off and the air flow from the heating and cooling system is stopped in that classroom. This allows the classroom to be heated or cooled by the outside air while saving energy. If you think your classrooms heating and air conditioning system is not working you should check to see if the windows are closed before requesting service.

MD Building Offices

Every office in the MD building has one of these controllers on the wall. This controller will give you the ability to fine tune your office air temperature more to your liking. There are multiple controllers linked to ten different systems. The controllers are in groups that range from four controllers on one system to twenty two. In each group there is one controller that is the master. The master controller determines whether the system is in heating or cooling as well as controlling the air damper in that particular office. The slave controllers on the system control the air dampers which are in the ceiling registers in their respective offices. The controllers have a snow flake on the left and a flame on the right. When the dial indicator on the master is at the twelve o’clock position the heat setting for the system is 68 and the cool setting is 74. When the dial is turned to the right (flame) the system temperatures will increase. When turned to the Left (snowflake) the system temperatures will decrease. The amount of control is relative to how far the dial is turned left or right with a maximum of two degrees either way. The same applies to the slave controllers except when the dial indicator is in the twelve o’clock position the heating and cooling set points are representative of what the master controller is set at.  You can adjust your office controller up to two degrees warmer or cooler from that setting.

EXAMPLE:  The master controller has been calling for heat so there is warm air coming out of all the registers on your system. Your office has now warmed to the relative setting on your controller so the controller tells the damper in your ceiling register to close down to slow the flow of warm air into your office. Depending on how far off your controllers setting is from the masters setting your damper may close all the way or just a little. When the master controller is calling for cooling the entire system will be blowing cool air. The damper will again adjust to maintain the setting on your controller. This time closing to make your office warmer and opening to make it cooler. If multiple offices on your system are to warm or to cold check the master controller for your system. It may be set to far right or left.

The exterior windows in the offices are linked to the air dampers that are located in the ceiling registers in their respective offices. When the windows are open the damper will close and the air flow to the office will stop. This allows you to heat or cool your office with outside air while saving energy.

Master Control Locations

Master Locations Offices On System
MD-155D MD-140, MD-143, MD-144, MD-147, MD-148, MD-151, MD-152, MD-154, MD-155D, MD-156
MD-155 MD-136, MD-141, MD-145, MD-146, MD-149, MD-150, MD-153, MD-155
MD-242 MD-239, MD-240, MD-241, MD-242, MD-245, MD-246
MD-250 MD-243, MD-244, MD-249, MD-250
(West Lounge)
MD-247, MD-248, MD-251, MD-252, MD-253, MD-254, MD-255, MD-258, MD-259, MD-260, MD-261, MD-266, MD-267, MD-268, MD-269, MD-272, MD-273, MD-274, MD-275, MD-278, MD-279, MD-280
MD-256 MD-251, MD-256, MD-262, MD-263, MD-264, MD-265, MD-270, MD-271, MD-276, MD-277, MD-281
MD-350 MD-343, MD-344, MD-349, MD-350
MD-345 MD-339, MD-340, MD-341, MD-342, MD-345, MD-346
(West Lounge)
MD-347, MD-348, MD-351, MD-352, MD-353, MD-354, MD-355, MD-358, MD-359, MD-360, MD-361, MD-366, MD-367, MD-368, MD-369, MD-372, MD-373, MD-374, MD-375, MD-378, MD-379, MD-380
MD-356 MD-351, MD-356, MD-357, MD-362, MD-363, MD-364, MD-365, MD-370, MD-371, MD-376, MD-377, MD-381, MD-382