We have been informed by the Student Health Center that your physicians request for you to have a room air conditioner has been approved.  In order to maintain the safety and condition of our buildings, we require that all student owned room air conditioners on campus either be inspected for safe and secure installation by Facilities Management staff or be installed by Facilities Management staff.  Because this is mandatory, there will be no charge for this service. If you would like us to install your AC, please contact Facilities Management upon your arrival to campus and after your AC has been placed in the room and is ready for installation. Installations are essentially on a first come, first served basis and your AC must be in the room and placed under the window prior to placing your request for installation.  Facilities Management can be reached on the web or you may also call Work Control directly at 757.221.2270. Please DO NOT call or submit your request to Facilities Management prior to your arrival.

Please note that the following conditions apply to the installation of private air conditioners in student rooms: Residents must provide their own air conditioner. Air conditioners must be wired for 110-120 volts and should not exceed 6000 BTUs. Because of the age of some of our buildings, electrical capacities vary.  Residents may need to limit or adjust use of their air conditioner so as not to trip circuit breakers, especially as this may affect electricity in other rooms. Please note the air conditioner size restrictions are included at the end of this message. If your residence hall is not listed, there are no special size restrictions. All installations must be inspected or completed by Facilities Management personnel. Facilities Management personnel will be working throughout check-in to install air conditioners. Given the volume of air conditioner installation requests that are received, we recognize that some residents may wish to install their air conditioners prior to the arrival of  Facilities Management personnel.

If you choose to install your own air conditioner, leave your screen inside the room.  Facilities staff will remove it when they come by to inspect and secure the air conditioner (including any wood panels needed to ensure a tight fit).  Do not hammer on the window frame or force the air conditioner into the window.   Residents will be held responsible for any damage incurred to the building as well as face possible judicial action due to the unauthorized or improper installation of an air conditioner by anyone other than Facilities Management personnel. If you have further questions, please contact our office [[living]]. Director of Housing Operations Window Air Conditioners - Special Size Restrictions Barrett, Chandler, Hardy, Lemon, One Tribe Place, Tribe Square Window units are not permitted to maintain positive air pressure settings in these buildings.  The heat and air conditioning is on-demand in each room at all times during the year. (Dinwiddie, Fauquier, Gooch, Nicholson, Spotswood)

Height no greater than 17" (Giles, Harrison, Nicholas, Page, Pleasants, Preston)rate residential hvac units Height no greater than 20"diy ac repair parts Green & Gold Village (All buildings)grand air ac unit 201, 204, 205, 208, 301, 304, 305, 308 Units no larger than 21.5" high by 17.5" wide* 106, 109, 111, 202, 203, 206, 207, 302, 303, 306, 307 Units no larger than 21.5" high by 23" wide * A casement-slide unit will fit these dimensions.Written The main assumptions include outside and inside design temperatures; 35C outside may be appropriate for where you are geographically, but 19C inside is too cold. The common indoor design temperature that most people consider “comfortable” is 22–23C, and many energy-conscious folks set the setpoint at 25C and put shorts and a tank top on, realizing the cooler it is, the more energy the AC unit will use.

You could design and install a system to maintain 19C when it’s 35C outside but that would be rare, and so most standard AC systems would be undersized for that, as you’ve noticed.Written I can say with certainty that reaching 19C is NOT one of them. My assertion is that your demands are too optimistic about the energy conservation needs of the world at large. In addition, most people would find 19C uncomfortably cold. Having said that, the assumptions are widely available from ASHRAE and others, they include an indoor design temperature, an outdoor design temperature varied by area, humidity, number of air exchanges, the type of walls, the type of windows and number the type and number of doors, the quality of weatherstripping, the amount of wall, ceiling, and floor insulation, and the number of cubic feet of space. Add occupant load, equipment heat, and lighting to that and you begin to have enough information for a “proper” guesstimate of loading on your air conditioning equipment.

Frankly, for window units it isn’t bothered with. In a house these units are ineffective. You can and will overcool certain areas and be uncomfortably hot in others. The air flows from room to room.Your assumption that A/C units are sized at 9000 BTU for average rooms implies a few things about an average room. Is your average room 9 x 12 or is it 30 x 45? Just what is “average” in your view? Do you live in the Yukon or in Panama? These are significant factors.Written The normal assumptions would be amount of insulation, relative humidity, outside air temperature, the number of times the air changes in an hour, room volumes and proportions, number of people in a room, their activity levels, amount of sunlight that can enter the room, the level of lighting in the room and what kind along with other heat sources such as cooking and computers. Another factor is that the 9000 btu/hr air conditioner may not be 9000 btu/hr or may not be 9000/btu per hour for the temperature difference you are trying to get.

The first thing I noticed is that I think your low temperature is 5°C lower than it is assumed to be. Since I don’t know where you are other than not likely in the US, I can’t even look up the assumptions.Written In my humble opinion, it would be better to have a slightly undersized forced air cooling system than a slightly oversized system. The reason being that there are a lot if variables to take into account like insulation factor, actual cubic footage, and window types for example. While it is true that oversized units will be installed in a structure that is known to have an insulation deficiency or, say, high ceilings (more cubic footage of total air); in a modern well insulated home system are sized based on the average high temperatures of the hottest month when cooling is being used.Expect a properly sized cooling unit to run continuously after this average high temperature is surpassed. If the temperature of the particular day soars over that average high temperature, then the cooling unit will lose a little ground on maintaining the number for which the operator has set for the thermostat to call.

A little discomfort may be felt by the inhabitants of the subject home, but; The unit will not cut off and will run continuously removing humidity from the air.Now consider an oversized unit in the subject application. On the very hottest days, an oversized unit may perform better than your neighbors smaller unit, but; it's tell is that far more numerous average hot days that will spoil the victory. An oversized unit will satisfy the thermostat repeatedly on average hot days and the time lag in between anticipated run times is when the people in the dweling will start to feel some humid stuffiness. As the too large unit satisfies the thermostat, the people may feel too cold for a short span of time before the stuffiness sets in and they begin wondering, “When the heck is the AC going to turn back on?”It's true that a force air cooling system does lower the air temperature inside a dweling, but; perhaps a far more important role of an air conditioning system is to remove humidity from the interior air so when inhabitants sweat it will evaporate from their skin and give them a sense of comfort, as opposed to first being cold and then getting a little sticky before the too large unit kicks back in and gets them cold again.