The solar system on top of the Jean Canfield Building is the largest single unit in Canada. (Pat Martel/CBC)

One of P.E.I.'s most environmentally-friendly buildings has had to supplement its green systems with some old-fashioned electric heaters for the comfort of the people who work there.

When the Jean Canfield Building, a five-storey federal office tower in downtown Charlottetown, opened two years ago it included a number of new technologies to lessen its ecological impact. On its roof sits the largest single solar power system in Canada. It can generate up to 139 kW of electricity.

But now some of that power will be used to operate about 75 new electric heaters. The heaters were installed in the existing floor vents, after employees who work next to windows complained about the cold.

Changes not uncommon

Kerry Taylor, director of Public Works Canada for P.E.I., said this kind of change in a new building is not unusual.

"This is something that you find when you open a big building like this," said Taylor.

"There are some things you have to add, there are maybe some things you have to take out to make it more efficient, and that's pretty common in any building whether it's government or private sector."

Taylor says the heaters will only be used on the very coldest winter days.

There are still some adjustments to be made with the heaters, with some workers complaining it is now too hot near the vents.