If you’re simply installing a window unit, you can easily do this yourself. Window units are designed for quick and easy DIY installation. However, if you’re thinking to save money on the cost of central air installation, think again. The guy on TV might make it look easy, but it involves choosing the right unit for your home, plus possibly installing ducts — and you’ll need to have a good understanding of how your duct system works. Plus, you’re legally required to have certification to purchase or even handle some types of refrigerant. This isn’t meant to be a DIY project, and trying to make it into one could make it even costlier, especially if you damage anything.
Recommendation: Professionals only.

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