Upon arrival homeowner stated that their gas bill from last month was higher then normal, they had a concern that the system might be leaking gas or not running as efficient. Checked and tested system in heat mode, checked gas pressure and also performed a gas leak search on piping on roof. Dropped gas pressure from 3.7 to 3.2, found no leaks on gas piping from roof to system. Informed homeowner to run system as usual this month and compare this this months bill to last months. Homeowner will give us a call if there are no changes.