Typical costs of a 25-year lease show that salaries 
out way energy costs by about 30-fold.

Therefore, factors that influence the effectiveness of staff will lead to far greater financial impacts than those which affect building efficiency. 

For companies with air conditioning, justification for investments in window film tend to be made on the savings in their soaring energy costs.

Also, major savings are made in the cost avoidance of upgrading to an air conditioning system which can cope better.

Payback periods justified on energy savings are usually between 1.5 and 5 years.

However, it is the benefits associated with human productivity, where dramatic benefits are achievable.

Research summarized on this site demonstrate that management of glare, natural daylight and heat can improve productivity by a few percent up to 25 percent.

Breakdown of occupancy costs on a typical 25-year office lease. 

Salaries of occupants	85%
Building construction cost excluding land	6.5%
Heating, Cooling and Lighting	3%
Building, Mechanical and Electrical Maintenance	2.75%
Furnishings and Furniture	1.75%
Cleaning, Security etc.	1%

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