1. An equipment enclosure, comprising:a temperature-controlled equipment chamber for housing equipment in said equipment enclosure; and
temperature control components that comprise:
an inside air inlet arranged to receive air from said equipment chamber;
an inside air outlet arranged to deliver air to said equipment chamber;
said inside air inlet and said inside air outlet each being on an inside cover;
a first outside air outlet arranged to deliver air to outside said equipment enclosure;
a second outside air outlet arranged to deliver air to outside said equipment enclosure;
a first outside air inlet arranged to receive air from outside said equipment enclosure;
a second outside air inlet arranged to receive air from outside said equipment enclosure;
said first outside air outlet, said second outside air outlet, said first outside air inlet and said second outside air inlet each being on an outside cover;
an interior air exhaust pathway extending between said inside air inlet and said first outside air outlet for venting interior air in said interior equipment chamber to outside said enclosure;
an interior air return pathway extending between said inside air inlet and said inside air outlet for recirculating interior air in said interior equipment chamber;
a first controllable damper operable to selectively communicate air from said inside air inlet to said air exhaust pathway and said interior air return pathway;
a fresh air inlet pathway extending between said first outside air inlet and said inside air outlet;
a second controllable damper operable to selectively communicate air from said interior air return pathway and said fresh air inlet pathway to said inside air outlet;
a primary air mover disposed to move air through said interior air return pathway and said fresh air inlet pathway;
an air heater in said interior air return pathway;
an air conditioning evaporator in said interior air return pathway;
an air conditioning warm air vent pathway extending between said second outside air inlet and said second outside air outlet;
an air conditioning condenser in said air conditioning warm air vent pathway;
a variable speed air conditioning compressor operably connected to pump a coolant through a coolant loop that includes said air conditioning condenser and air conditioning evaporator;
an air conditioning air mover disposed to move air through said air conditioning warm air vent pathway;
upper and low temperature sensors for sensing temperature in upper and lower portions of said equipment chamber;
an outside air temperature sensor for sensing outside air temperature; and
a temperature controller operable to control said dampers, said air movers and said air conditioning compressor based on temperature readings provided by said temperature sensors.