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There are many reasons for a reduction in dryer efficiency, but not all of them require replacement dryer parts. One of the simplest causes can be found in your lint trap. Many assume that lint is only found in the trap. Lint can also get into your dryer's vent ducts.
You will need to pull the dryer out from the wall, disconnect the pipe or vent hose, then clean out both the hose and the connection to the dryer.
Remove all the lint, then be sure to replace the hose and secure it. Try a load of laundry and see if this solution fixes your efficiency problems. If not, you may have a faulty heating element or other issue that needs troubleshooting. Replacement dryer parts will be necessary for problems like a burned out heating element or a bad thermostat.