How Air Conditioners Work. Air conditioners use refrigeration to chill indoor air, taking advantage of a remarkable physical law: When a liquid converts to a gas (in a process called phase conversion), it absorbs heat.
Baldwin, Baltimore County, Maryland Land for Sale. Looking for rural homes and land for sale in Baldwin, Baltimore County, Maryland? LandWatch.com has thousands of rural properties in Baldwin, Baltimore County, Maryland, including hunting & fishing properties, cabins, Land for sale and land auctions.
Baldwin, Maryland. Baldwin is an unincorporated community in Baltimore County, Maryland, United States. The United States Postal Service has assigned Baldwin the ZIP Code 21013. Until 1958, this community was served by the Maryland and Pennsylvania Railroad at milepost 18.4.