[josephebricky]

My ruud silhouette 2 will not heat up past 67 degrees. It is set to 72, and the filter is new
The furnace is 10 years old. It is 7 degrees out side. And it continualy turns on and off

[hvac1000]

Low gas pressure can cause this problem since the furnace will not run at its maximum capacity. The turning on and off could be a defective thermostat or a service problem with the furnace itself. If you have the proper tools and the knowledge to use them have at it if not call for On Site Service.