Price History for Maintenance Kit With 45 Water Panel for 400,400A, and 400M Whole-House Humidifiers
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Maintenance Kit With 45 Water Panel for 400,400A, and 400M Whole-House Humidifiers
This AprilAire 4788 Humidifier Maintenance Kit contains all components for step-by-step maintenance of your AprilAire Whole-House Humidifier (sold separately). Our evaporative humidifiers work by piping water i
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Price History Chart
Recorded price history
Showing the 30 most recent of 54 recorded prices.
| Date | Price |
|---|---|
| Aug 7, 2026 | $128.25 |
| Aug 6, 2026 | $137.99 |
| Aug 3, 2026 | $123.53 |
| Jul 30, 2026 | $123.31 |
| Jul 26, 2026 | $122.34 |
| Jul 25, 2026 | $131.99 |
| Jul 22, 2026 | $129.00 |
| Jul 20, 2026 | $131.99 |
| Jul 18, 2026 | $128.25 |
| Jul 14, 2026 | $130.83 |
| Jul 8, 2026 | $104.20 |
| Jul 3, 2026 | $120.05 |
| Jun 26, 2026 | $127.74 |
| Jun 25, 2026 | $128.25 |
| Jun 24, 2026 | $129.09 |
| Jun 19, 2026 | $131.99 |
| Jun 16, 2026 | $128.95 |
| Jun 15, 2026 | $128.49 |
| Jun 14, 2026 | $128.23 |
| Jun 6, 2026 | $116.42 |
| Apr 29, 2026 | $128.25 |
| Apr 26, 2026 | $131.99 |
| Apr 23, 2026 | $124.93 |
| Apr 12, 2026 | $128.79 |
| Apr 3, 2026 | $106.55 |
| Mar 28, 2026 | $118.39 |
| Mar 25, 2026 | $131.99 |
| Mar 22, 2026 | $105.50 |
| Mar 20, 2026 | $131.99 |
| Mar 19, 2026 | $105.50 |
Analysis
Maintenance Kit With 45 Water Panel for 400,400A, and 400M Whole-House Humidifiers price analysis
Price analysis for Maintenance Kit With 45 Water Panel for 400,400A, and 400M Whole-House Humidifiers at Home Depot: Today's price is $128.25. Current price is 1% above the 90-day average of $126.54 (a $1.71 above the running mean).
- Currently listed at $128.25, which is $3.26 above the original MSRP of $124.99.
- Current price is 1% above the 90-day average of $126.54 (a $1.71 above the running mean).
- The lowest recorded price on PriceWatchPro was $100.69 on January 25, 2026. That's $27.56 below today's price.
- The highest recorded price on PriceWatchPro was $137.99 on August 6, 2026. Today's price is $9.74 below that peak.
- 30-day trend: trending down 2.0% from $130.83 to $128.25.
- Across 53 tracked price changes, the listing has dropped 26 times with an average drop of $12.69.
- PriceWatchPro has been tracking this listing since October 31, 2025 (282 days of price history).
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