Things You Will Need
If an air conditioner has been removed or replaced with a larger unit and moved to a different location, you'll want to fill the hole in the exterior brick where the old air conditioner was placed, both for aesthetics and to help keep your home energy efficient.
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Clean out any debris or bits of old brick from the hole with a wire brush.
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Patch up the interior side of the hole. How this is done will depend on the interior surface. For plaster or drywall, a small plug the size of the hole can be cut out with a drywall knife and then glued into place. Smooth drywall plaster over the hole to seal.
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Mix together a batch of plastering glue to water in a thin mixture, about 1 part of glue to 5 parts water. Apply with a brush to the inside of the hole. You can also use waterproof sealant manufactured for outdoor use. Allow the hole to dry.
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Mix up a batch of patching mortar for the exterior. Follow the manufacturer's instructions when mixing. If you want to match the surrounding brickwork, pulverize a piece of leftover brick that matches the rest of the wall. Mix up these pieces with the mortar.
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Apply the patching mortar to the hole with a trowel. Push the mortar into the hole as you work so that it penetrates all the way to the back of the hole. Scrape off any excess.
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Allow the mortar time to dry. You may need to cover the area with a plastic sheet or wet it periodically in order for it to cure fully. This will depend on the mixture used.