iGS-061 is a stand alone CO2 controller that does not manage ventilation simultaneously with CO2 level enhancement. Some CO2 may be vented outside while CO2 enrichment is going on. Many growers use iGS-061 in an air conditioned room. Many others use a reverse relay like iLS120-OFF that stops the intake-exhaust fan(s) while CO2 is enhanced. An horticultural environmental climate controller like iGS-110 or iGS-111 (iLS-OFF recommended) can control the air conditionning unit and even large capacity air conditionning units with iGS-DCS relay. Other gardeners prefer environmental more complete controllers that can manage CO2 and ventilation like iGS-220 or iGS-221. This last one can also manage large capacity air conditionning units thru an iGS-DCS relay unit.