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The 2005's have freeze guard and it works quite well. A simple test can be performed to tell if your unit is cooling properly. Take a digital temperture probe, and measure the outlet temp on the A/C. It should be 20-30 degrees cooler than ambient. Also, I would remove the filter grate and look at how the ducts are sealed. Quite often they are not sealed correctly, and this results in your cold air being re-cycled through the A/C unit, and/or pumped into the attic. What size unit do you have?
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