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Servel (the gas air-conditioning company) was there with a new, higher-efficiency product. The process, which uses a gas flame to produce cooling in a continuous absorption cycle, has always been plagued by the fact that the method isn''t very energy efficient. Servel didn''t change the process but just tightened it up, resulting in a 30% efficiency increase. Gas-fired air conditioners are available in sizes from 3 tons to 25 tons. A more efficient way of getting cooling from gas is to use the gas to drive a combustion engine, which drives a compressor. And while this isn''t new technology either, it is for my friends over at Goettl, a Phoenix-based hvac/swamp cooler manufacturer that has specialized in the residential/light-commercial market. The company''s gas-driven split-package air conditioners (the compressors/motors are remotely located) are available in 15-ton and 20-ton sizes.

Before you begin, also call a building inspector to determine necessary posthole depths for your project and to find out if you need a building permit. They''re generally required for fences and decks.Have your layout all set--time is moneyScrupulously lay out your postholes before renting an auger so you can be using the tool the whole time you''re paying for it. Pay close attention to locations and mark the exact centers of the holes with stakes. It''s nearly impossible to move or reposition a hole once you''ve started boring, so it''s important to begin in the right spot. If you need wider holes than the auger will drill or if you need to slightly reposition a hole, you can easily carve away the sides with hand tools.

In a 550-gallon size, a more common non-UL tank and dike combination would cost $1,067. A 1,000-gallon version would cost $1,880.Another option for providing secondary containment is a double-walled tank. This design features a tank within a tank with a 12-inch-wide cavity on one end. An inspection hole allows monitoring for fuel leaks from the inside tank. A 300-gallon version of We-Mac''s double-walled tank sells for $960; a 500-gallon size for $1,075; and a 1,000-gallon size for $2,025.Other options for containment include concrete walls or earthen dikes and liners. A catch basin, which is a 5-gallon liquid-tight bucket around the fill pipe, or an overfill warning device add additional protection.