A controlled agricultural system, comprising: A contained growing space; and either: an enthalpy wheel capable of transferring sensible and latent heat, the enthalpy wheel positioned in and rotatable through both a recirculating air duct and an outside air duct, the recirculating air duct adjacent the outside air duct and in fluid connection with the contained growing space and one or more recirculation fans to return recirculating air to the contained growing space, the outside air duct in fluid connection with one or more outside air fans positioned to cause outside air to flow countercurrent to recirculating air; and a cooling coil within the recirculating air duct, downstream and in series with the enthalpy wheel, the cooling coil circulating a heat transfer fluid to remove heat from the recirculating air; or a heat wheel capable of transferring sensible heat, the heat wheel positioned in and rotatable through both a recirculating air duct and an outside air duct, the recirculating air duct adjacent the outside air duct and in fluid connection with the contained growing space and one or more recirculation fans to return recirculating air to the contained growing space, the outside air duct in fluid connection with one or more outside air fans positioned to cause outside air to flow countercurrent to recirculating air; and a desiccant wheel capable of transferring latent heat, the desiccant wheel positioned in and rotatable through the recirculating air duct in series with the heat wheel such that recirculating air passes through the desiccant wheel prior to passing through the heat wheel; and a cooling coil within the recirculating air duct, downstream of and in series with the heat wheel, the cooling coil circulating a heat transfer fluid to remove heat from the recirculating air. an enthalpy wheel capable of transferring sensible and latent heat, the enthalpy wheel positioned in and rotatable through both a recirculating air duct and an outside air duct, the recirculating air duct adjacent the outside air duct and in fluid connection with the contained growing space and one or more recirculation fans to return recirculating air to the contained growing space, the outside air duct in fluid connection with one or more outside air fans positioned to cause outside air to flow countercurrent to recirculating air; and a cooling coil within the recirculating air duct, downstream and in series with the enthalpy wheel, the cooling coil circulating a heat transfer fluid to remove heat from the recirculating air; or a heat wheel capable of transferring sensible heat, the heat wheel positioned in and rotatable through both a recirculating air duct and an outside air duct, the recirculating air duct adjacent the outside air duct and in fluid connection with the contained growing space and one or more recirculation fans to return recirculating air to the contained growing space, the outside air duct in fluid connection with one or more outside air fans positioned to cause outside air to flow countercurrent to recirculating air; and a desiccant wheel capable of transferring latent heat, the desiccant wheel positioned in and rotatable through the recirculating air duct in series with the heat wheel such that recirculating air passes through the desiccant wheel prior to passing through the heat wheel; and a cooling coil within the recirculating air duct, downstream of and in series with the heat wheel, the cooling coil circulating a heat transfer fluid to remove heat from the recirculating air.