I have 10 Kidde Smoke Alarm model 1276 in my house. They r 11 yrs old. Is there a newer model to replace the 1276? Should I use the same model if available or go with the a new model?

SOURCE: kidde Carbon Monoxide Alarms

YES!!!! If this unit is working properly you should not be in the house. Maximum allowable safety level for an 8 hour period is 50! If you think it's working properly call the fire department! This will cause dizziness,nausea,etc. Let your fire department find the problem! If you don't believe me follow this link to owner's manual but do it quickly: http://www.kiddeus.com/utcfs/ws-384/Assets/KN-COB-B(9CO5)en.pdf

SOURCE: 1 chirp every 30 seconds

it is not the battery problem, you need to get a replacement.
the circuite board is bad.

SOURCE: kidde nighthawk Carbon Monoxide & Smoke Alarm single beeps

If detector is more then 5 years old it will beep every 30 seconde to wirn you the sensor in the detector needs to be replaced. bying a new detector would be better.

SOURCE: kidde smoke alarm won't stop chirping

Most smoke detecotrs have a limited lifespan of 5-10 years. On the underside of the detectors should be a sticker with installed dated or replace by date. If changing the batteries doesn't stop the chirping it is most like time to replace the detector. If you check the manufacturer website they will give you a life expectancy for your detector.

SOURCE: I just fixed a new Kidde alarm hardwired with both

The normal condition for the green LED is solid. A flashing green LED indicates memory of a prior alarm condition. Press the test for at least 2 seconds to reset the detector memory.