This logic was also applied to other areas such as turning off lights in the children's playground at night when there were no children in the restaurant or when natural daylight was sufficient.
Recycling of cardboard and some plastics in work areas has also proved a winner.
"We used to have three rubbish pick-ups a week here at Te Ngae. Now we are down to two - that will save me about $1000 a year."
Incorporating recycling into customer areas of the restaurants and reducing water consumption are areas he wants to look at in the future.
From next year, sustainability policies and initiatives will be included in all staff orientations so employees are immersed in the concept from day one.
"We will start seeing the real benefits in years two, three and four of our plans, once that culture becomes established.
"This is quite a paradigm shift in fast food," he said.
"If you talk to people about sustainability in business, McDonald's probably isn't at the top of their minds. Hopefully this will cause them to have a rethink."
Parry said demonstrating the savings made through sustainability initiatives in his Rotorua restaurants could see some of these pitched to the wider McDonald's group.