hmm..

building AHU system... medyo mahirap nga kumonek dyan.. bali ang lamig / hangin lang na pumapasok is due to the ducting / vent na naka abang sa building / office? In some offices (at least sa office ng wife ko where she works), naka ducting nga sa ceiling.. but the AHU is still per individual .. meaning sa office nila, may sariling AHU na naka kabit sa mga ducting na yun.. they have to manually turn on or off as needed... so they pay for their own electric bill for that.. kasama na sa metro nila..

in your case.. kung building admin ang may control ng on / off ng AHU (centralized malamang), I suppose you don't have much choice but to install an aircon for your room separate from that provided by the building.. kung papayagan ng building admin. a portable AC unit... depende din sa laki ng room eh.. 17sqm... anong sukat ng elevation (floor to ceiling)? that's still a lot bigger than the internal of a car... so halos room AC unit na ang kakailanganin mo dyan...

another option is to use the evaporative coolers / fans type of fan..

another possible issue.. sa mga medyo bagong appliances right now like aircon (window and split type), evaporative coolers.. most of these ay may remote control na.. so kahit there is power sa mains going into the unit.. it is still the remote that controls the on and off.... if it comes to a point na gagamit ka na ng ganitong klaseng appliance.. hindi sya ganun kadali i turn on ... may karagdagang complexity (digital electronics interface ) to simulate the "on" command of the remote... unlike those older units na pupuwede mong iwanan yung unit na naka on, tapos saksakan lang ang mag determine kung may power o wala (naka hugot ba o nakasaksak)... but if you leave the appliance on tapos hugutin mo saksakan at ibalik uli at naka on pa rin sya.. I guess okay na.. but most of the ones I've encountered.. nawawala talaga power and you have to use the remote to turn it on again..

I'm mentioning this because I'm coming from the idea that it would be a relay or a contactor that would trigger the ON / OFF of the aircon / fans / exhaust.... basically industrial electrical components para mas sturdy at readily available...

there's a forum on the net: www.electronicslab.ph... you may be able to get more ideas there...