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I have a Chamberlain LiftMaster Professional Garage Door opener (June 2007) with a wireless keypad to open the door but does not open consistently in cold weather. I would like to install a hardwired "key" solution so that the garage door opens consistently in all weather. Can this be done? Is there a specific cylinder I need to purchase for this task?

thanks

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    Keep in mind that a hardwired key means the wires will have to be physically present at that location, so it makes it a very easy target for someone that wants to get in the garage. These keys were common in houses I've seen built in the 80's but I haven't noticed many lately. – JPhi1618 Apr 19 '16 at 17:08
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    The keypads should be designed to work in all weather, but perhaps your battery isn't up to snuff. Look for batteries designed to deal with cold weather. – Daniel Griscom Apr 19 '16 at 17:49
  • Look for Lithium AAA or AA batteries. These hold up in cold weather. I use them in outdoor temperature sensors and a gate opener. They are expensive, but they do last a long time. – JPhi1618 Apr 19 '16 at 18:56
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    You'd need a momentary key switch, with a spring return, so that you can momentarily close the contacts rather than switching them long-term on or off. – Daniel Griscom May 19 '16 at 23:12
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Why not grab some interior standard outlet (120VAC), plug a 3 VDC transformer/converter in, and feed the battery connections directly inside the keypad? That guarantees plenty of power and avoids a rather messy job (installing a mechanical momentary keyswitch).

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Assuming your opener has the terminals for doing so, to hardwire this you would want either a double-momentary keyswitch, or a housing that takes a lock cylinder and uses its tailpiece to actuate a pair of momentary switches, plus appropriate mounting hardware and wires. The latter gives you more flexibility in picking a cylinder that matches, e.g., your house keys.

I agree that if the battery is good, and is appropriate for that weather, and there isn't an unreasonable amount of radio frequency interference (RFI) with the signal, a decent quality numeric pad should work. You may want to spend more time checking why it doesn't before investing in the wired switch.

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