RELIABILT vs Pella Windows
Both sold at Lowe's. RELIABILT is the budget vinyl option; Pella spans budget to premium. Which one is right for your project depends on budget, energy goals, and how long you plan to stay in the home.
RELIABILT windows start around $89 per window; Pella 150 Series starts around $150; Pella 250 Series starts around $250. All three are vinyl-framed double-pane windows sold at Lowe's. The functional difference at the entry level is minimal — all include Low-E glass and meet Energy Star requirements. The price gap reflects Pella's brand investment, wider style selection, and higher energy performance on upper-tier series. For a straightforward replacement project where budget is the priority, RELIABILT delivers comparable performance. For new construction or a home you plan to keep long-term, Pella's mid-range series offers better ratings and a stronger warranty.
Full Comparison
| Feature | RELIABILT | Pella 150 Series | Pella 250 Series |
|---|---|---|---|
| Sold At | Lowe's only | Lowe's | Lowe's |
| Starting Price (per window) | ~$89 | ~$150 | ~$250 |
| Frame Material | Vinyl | Vinyl | Vinyl |
| Glass Panes | Dual-pane | Dual-pane | Dual-pane |
| Low-E Glass | Yes | Yes | Yes |
| Argon Gas Fill | 3500 Series only | No (150 Series) | Yes |
| Energy Star Certified | Yes (select models) | Yes | Yes |
| Frame Warranty | Limited lifetime | Limited lifetime | Limited lifetime |
| Glass Warranty | Limited lifetime | 10 years (seal failure) | 10 years (seal failure) |
| Style Options | Double hung, single hung, sliding, replacement, new construction | Double hung, single hung, sliding, casement, awning, bay | Same as 150 + more sizes |
| Color Options | White, tan | White, tan, black | White, tan, black, clay |
| Installation Type | Replacement & new construction | Replacement & new construction | Replacement & new construction |
| Best For | Budget replacement projects | Mid-range replacement | New construction, energy upgrades |
Prices are approximate and vary by window size, region, and Lowe's promotions. Verify current pricing at your local Lowe's store or online.
When RELIABILT Makes Sense
RELIABILT windows are the right choice when you are replacing multiple windows on a fixed budget, renting the property, or the existing windows are functional but dated. The 3201 Series covers basic replacement needs at the lowest price point in the Lowe's vinyl window lineup. The 3500 Series adds argon-filled glass for slightly better insulation at a modest price increase.
For a home with 10 windows needing replacement, choosing RELIABILT over Pella 150 saves roughly $600–$800 in material costs alone before installation. That saving is significant in a whole-house project. If the windows are in a rental or a home you plan to sell within five years, the energy performance difference between RELIABILT and Pella 150 is unlikely to affect the return on investment.
Cost Example: 10-Window Replacement
| RELIABILT (10 windows) | ~$890 – $1,500 in materials |
| Pella 150 Series (10 windows) | ~$1,500 – $2,500 in materials |
| Pella 250 Series (10 windows) | ~$2,500 – $4,000 in materials |
Installation costs are the same regardless of brand — typically $150–$300 per window for professional installation. The window brand does not affect labor cost.
When Pella is Worth the Premium
Pella is the better choice when you are staying in the home long-term, building new construction, or targeting significant energy savings. The 250 Series with argon gas fill delivers measurably better U-factor and SHGC ratings than the entry-level RELIABILT 3201 Series. Over 10–15 years of heating and cooling, that difference in energy performance can offset part of the price premium.
Pella also offers window types that RELIABILT does not carry: casement, awning, and bay windows. If your project includes these styles, Pella is the only option between the two brands at Lowe's.
The 10-year glass seal warranty on Pella windows is more specific than RELIABILT's limited lifetime coverage, which is important in climates with extreme temperature swings where seal failure is more common over time.
Understanding U-Factor and SHGC
Two numbers matter when comparing window energy performance: U-factor (how well the window insulates; lower is better) and Solar Heat Gain Coefficient or SHGC (how much solar heat passes through; lower means less heat gain in summer).
| U-Factor | Both RELIABILT and Pella 150 Series typically fall in the 0.28–0.32 range for double-pane Low-E. Pella 250 Series with argon typically reaches 0.25–0.28. These are approximate values — check the NFRC label on the specific product for certified ratings. |
| SHGC | Both brands offer comparable SHGC values (0.20–0.30) on Low-E glass. Pella offers a wider range of Low-E coating options for climate-specific optimization on higher series. |
| Energy Star | Select models from both brands carry Energy Star certification. Certification requirements vary by climate zone (Northern, North-Central, South-Central, Southern). Verify the specific model's certification before purchase if this is a requirement. |
Replacement vs New Construction Installation
Both RELIABILT and Pella offer windows in replacement (insert) and new construction (nail fin) configurations. The installation type is determined by your project, not the brand.
| Replacement (Insert) | Fits into the existing window frame. Less invasive, lower labor cost. Best when the existing frame is structurally sound. See our replacement windows guide. |
| New Construction (Nail Fin) | Has a perimeter flange that nails into the rough opening framing. Required for new construction and full-frame replacement when the old frame is removed. See our new construction windows guide. |
Which One Should You Buy?
| Replace 5+ windows on a budget | RELIABILT 3201 Series. Lowest cost, Energy Star on select sizes, fits existing rough openings. |
| Replace 1–2 windows, quality matters | Pella 150 Series. Better style selection, closer to RELIABILT pricing at small quantities. |
| New construction or long-term home | Pella 250 Series. Argon fill, better energy ratings, broader size range. |
| Need casement or awning style | Pella only. RELIABILT does not offer these styles. |
| Rental property | RELIABILT. Budget-appropriate, functional, no need to invest in premium performance. |
Common Questions
Are RELIABILT and Pella windows the same quality?
At the entry level (RELIABILT 3201 vs Pella 150), the functional quality is comparable — both are vinyl-framed, dual-pane, Low-E windows that meet Energy Star requirements on select sizes. The difference is Pella's broader style range, more color options, and a more established warranty claim process. At the mid-range (Pella 250), Pella pulls ahead with argon gas fill and better certified energy ratings.
Can I mix RELIABILT and Pella windows in the same house?
Yes. There is no structural or functional issue with using different window brands in the same home. The main consideration is visual consistency — both brands offer white and tan frames, so mixing is straightforward in most homes. If you need a specific color like black on a street-facing wall, verify both brands carry it before committing.
Does Pella make RELIABILT windows?
No. RELIABILT windows are manufactured by Atrium Windows & Doors for Lowe's. Pella Corporation is a separate company that manufactures and sells its own branded windows. Both are sold at Lowe's but are distinct products from different manufacturers.
See our full guides on RELIABILT windows, double hung, replacement windows, and new construction windows. For door comparisons, see RELIABILT vs JELD-WEN and RELIABILT vs Kwikset.