The present invention relates to an improved air conditioning filter and cooling/heating coil that can easily be applied to new and existing air handling systems. The slant design of these components allows a more efficient heat transfer and particle entrapment than their conventional counterparts. By residing at an angle in their air handling enclosures, and by virtue of their oblique prismatic construction, more filter media can be used and more heat transfer surface area can be incorporated without offering any substantial additional impediments to the flow of air. At angles of 45 degrees air friction of the coil and filter are reduced by 40 to 55 percent.