RELIABILT Double Hung Windows
RELIABILT double hung windows have two operable sashes that both slide and tilt in. The most popular window style.
RELIABILT double hung windows are the most popular style, with both top and bottom sashes operable. Both sashes tilt inward for cleaning from inside the house. Priced from $89 to $300+ depending on size and series. Available in 3201 (budget) and 3500 (mid-range, argon-filled glass) series. Vinyl frame, dual-pane Low-E glass, fusion-welded corners for strength.
Advantages Over Single Hung
| Better Ventilation | Open top sash down and bottom sash up simultaneously for natural air circulation (warm air exits top, cool air enters bottom). |
| Easier Cleaning | Both sashes tilt in. Single hung only tilts the bottom sash, leaving the top fixed and hard to clean from upper floors. |
| More Versatile | Open just the top for rain-safe ventilation, just the bottom for maximum airflow, or both for cross-ventilation. |
How to Choose a Double Hung Window
Sizing: Measure the rough opening width at three points (top, middle, bottom) and height at three points (left, center, right). Use the smallest measurement for each. RELIABILT double hung windows come in standard sizes from 24"x36" to 48"x72". For non-standard openings, Lowe's offers custom sizing through their special order program.
Energy ratings: The 3201 Series has a U-factor near 0.30 and qualifies for Energy Star in northern and north-central zones. The 3500 Series uses argon gas between the panes, achieving a lower U-factor that meets Energy Star requirements across all US climate zones. If you are in Climate Zone 4 or higher (most of the South), the 3500 Series is worth the upgrade for the energy savings alone.
Climate considerations: Double hung windows have two operable sashes, which means more moving joints than a single hung. In extremely windy locations, verify the air infiltration rating. Both RELIABILT series perform well in standard conditions. For hurricane-prone areas, consider impact-rated alternatives. In cold climates, the dual-sash design allows you to open just the top sash slightly for ventilation without letting cold air pour in at floor level.
Grid options: RELIABILT double hung windows are available with no grids, colonial grids (6 or 9 lite), or prairie grids. Grids are between the glass panes (GBG), so they do not interfere with cleaning. Match the grid pattern to your home's architectural style.
Color choices: Both series are available in white and almond vinyl finishes. Vinyl color is consistent throughout the material, so scratches do not expose a different color underneath. White is the most popular choice and blends with most exterior color schemes. Almond works well with warmer-toned siding and brick.
Common Problems and Fixes
Condensation between panes: Fog or moisture between the two glass layers means the IGU (insulated glass unit) seal has broken. The glass unit must be replaced. RELIABILT covers this under the limited lifetime warranty. Contact Lowe's with your proof of purchase to start a claim.
Drafty seals: If you feel air around the sash edges, the weatherstripping has likely compressed or shifted. Tilt the sash in and inspect the seals along the sides and meeting rail. Replace worn weatherstripping with compatible vinyl or foam strip. Also check the exterior caulk line for cracks.
Balance failure: Each sash is held by a pair of balances (spring-loaded mechanisms inside the frame). When a balance fails, the sash drops when released or is difficult to raise. Replacement balances are specific to the window size and weight. Note the sash weight and balance length before ordering a replacement at Lowe's.
Sash hard to open or tilt: Accumulated dirt in the tracks is the usual cause. Vacuum the tracks, wipe with a damp cloth, and apply dry silicone spray. If the tilt latches are stiff, press them inward firmly while pulling the sash top toward you. Do not force the latches with tools, which can crack the plastic.
Exterior condensation: Morning dew on the outer glass surface is normal with Low-E windows. It means the coating is keeping heat inside your home rather than warming the outer pane. This evaporates as the sun heats the glass and is not a defect.
Broken glass: If a pane cracks from impact or stress, the full insulated glass unit must be replaced. Contact Lowe's to order a replacement IGU sized for your specific window. Seal failure and thermal stress cracks may be covered under the RELIABILT limited lifetime warranty.
Maintenance Guide
Cleaning vinyl frames: Use mild dish soap and warm water with a soft cloth. Avoid abrasive pads and solvent-based cleaners, which can scratch or discolor the vinyl surface. Clean at least twice a year. For stubborn stains, a paste of baking soda and water works without damaging the finish.
Lubricating tracks: Vacuum the jamb tracks once or twice a year to remove dust buildup. Spray a thin coat of dry silicone lubricant on the track surfaces. Avoid WD-40 or oil-based products that attract dirt. The tilt latch pivot points also benefit from a small drop of silicone lubricant annually.
Replacing weatherstripping: Double hung windows have weatherstripping on both sashes plus the meeting rail. Over time, these seals flatten and lose their air-blocking ability. Peel out the old strip and press in new self-adhesive weatherstripping rated for vinyl windows. This is an inexpensive repair that can noticeably reduce heating and cooling costs.
Checking seals: Each spring, inspect the caulk where the window frame meets the exterior wall. If you see gaps or cracking, remove the old caulk and apply a fresh bead of exterior-grade silicone sealant. Inside, check the seam between the frame and drywall for gaps and fill with paintable latex caulk if needed.
Screen care: Double hung windows typically use a full-height screen on the exterior. Remove the screen once a year, rinse it with a hose, and inspect for tears or frame damage. A damaged screen lets insects in and reduces the value of having operable sashes. Replacement screens are available at Lowe's by window size.
Hardware check: Inspect the sash locks, tilt latches, and balance shoes annually. Tighten any loose screws. If a tilt latch becomes stiff, apply a small amount of dry silicone lubricant to the pivot point. If the cam lock no longer pulls the sashes tight at the meeting rail, reposition the keeper for a snug fit.
Frequently Asked Questions
Is a double hung window worth the extra cost over single hung?
For most living spaces, yes. The ability to tilt both sashes in makes cleaning significantly easier, especially on upper floors. The improved ventilation from opening both sashes is also a real benefit. For utility rooms, garages, or budget-constrained projects, single hung saves 10-15% and performs the same thermally.
Should I choose the 3201 or 3500 Series?
The 3201 is a solid budget option with dual-pane Low-E glass that meets Energy Star in northern zones. The 3500 adds argon gas fill for better insulation, qualifies for Energy Star across all US zones, and has slightly better hardware. If your home is in Climate Zone 4 or higher, or if you want maximum energy savings, the 3500 pays back the price difference through lower utility bills.
Can I install RELIABILT double hung windows myself?
Replacement double hung windows are a common DIY project. You remove the old sashes and install the new insert window in the existing frame. New construction windows require framing knowledge and proper flashing, so they are better suited for experienced DIYers or professional installers.
Either way, you will need a tape measure, level, drill, shims, low-expansion foam, and caulk. Allow 30-60 minutes per window after the first one.
Double hung is the default recommendation for most homeowners. For a lower budget, see single hung. For wide openings where vertical space is limited, try sliding windows. All windows use the same window casing moulding for finishing.
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