Your first paragraph is advocating for ventilation, which is great but there's been so much incentive to reduce building energy consumption (heating/cooling) that recirculating, filtration and other technologies have resulted in offices becoming almost sealed off. We are now moving towards more balanced models as people don't feel comfortable in such offices e.g. sick building syndrome.
my description is a bare outline, actusl instalation could easily include a heat exchanger, and by going to radiant heat, it's surfaces that provide the heat,ie: floors (warm/cool feet) and walls, cielings, with humidity controll bieng done in air
HCAC is decidedly unsexy engineering, but it can effect, all of every day so worth a bit of attention
