I can recommend the following:
Air con by Secure & Cool (Karen Jones) excellent service,they did ours last May 2006 they advertise in the Costa blanca News. We had an air-con unit in the lounge and one in the master bedroom cost about Euros 1500. Very good very quite both with heating for the winter. WSe stayed over in December and the units were excellent,
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OMAC security grills based in Los Montisinos another excellent service. They sent us pictures via e-mail of the completed grills. We are on R5 overlooking the Golf Course if you wnat to have a look at their work.