When you buy through our links, Business Insider may earn an affiliate commission. Learn more I've tested 30 units for our best air conditioner guide over the last six years. I evaluate many ...

The extra hose brings in outdoor air to cool the condenser ... side of the room to assess how much the unit decreases the room's temperature. The Friedrich Dual-Hose Zoneaire was the best at ...

Friedrich Air Conditioning produces residential and commercial air conditioning units. Its products include window units, through-the-wall units and ductless systems. Friedrich features quiet ...