Virginians have a chance this weekend to save energy … and money. The state’s first sales-tax holiday on certain energy-efficient products begins today and continues through Monday. Shoppers in stores and online won’t have to pay the five percent sales tax on certain items priced up to $2,500. The items must have the Energy Star logo that indicates they meet federal energy efficiency guidelines. The tax holiday applies to new and used refrigerators, washing machines, air conditioners, ceiling fans, dishwashers, dehumidifiers, compact fluorescent light bulbs and programmable thermostats. Items such as freezers, dryers, furnaces, heat pumps and windows are excluded, as are electronics such as computers and televisions. The state expects consumers to spend more than $3 million on tax-exempt items during the holiday. Localities will miss out on an estimated $166,000 in tax revenue.