The EPA estimates (for all insulation) that homeowners who air seal and insulate their homes could save as much as 20% of heating and cooling costs (or up to 10% of your total energy costs). (Source: Energy Star)
SPF is not as susceptible to heat transfer as most other insulation material, with R-values usually between 3.5 - 6.5 per inch of thickness. R-value is used to rate a material's ability to resist heat transfer. The greater the R-value, the more efficient the insulation.
Due to the increased efficiency of your home after installing SPF, you may qualify for tax credits equal to 30% of your purchase up to $1500 per year.
Local utilities will often offer rebates for efficiency upgrades to your home. You should check with your provider to verify eligibility.
For more information about federal tax credits you can visit the ENERGY STAR web site on Federal Tax Credits for Consumer Energy Efficiency.
The size of your HVAC system can be reduced by as much as 35% without losing efficiency and comfort.
(Source: Canadian Urethane Foam Contractors Association)
SPF is an efficient air barrier.
SPF is typically used to prevent drafts from any windows, doors, and attics creating a more comfortable interior environment.
SPF also acts as an effective sound barrier.
Using SPF effectively seals your home from outside intruders like insects and other pests.