HVAC Filters / Subscription DTC
How Nano Home Cut Shipping Costs 30% with DIM-Weight Optimization
Subscription Air Filters at Scale
Nano Home sells residential HVAC air filters through a subscription model — customers select their filter size, choose a replacement frequency, and receive filters automatically on schedule. With dozens of filter dimensions and multiple filtration ratings, Nano Home manages a complex SKU matrix where every size and type must be picked accurately and shipped cost-effectively.
The fulfillment challenge for air filters is dimensional weight. Filters are physically large but lightweight, which means carriers charge based on package dimensions rather than actual weight. Nano Home's previous fulfillment provider shipped filters in oversized boxes, inflating DIM-weight charges on every order and eroding subscription margins.
Founders 3PL re-engineered Nano Home's packaging and shipping strategy to minimize dimensional weight across every filter size, while maintaining the subscription cadence their customers depend on.
DIM-Weight Packaging Optimization
Air filters come in dozens of sizes — from 14x14x1 to 20x25x4 — and each size has different dimensional weight characteristics. Nano Home's previous provider used a one-size-fits-most approach to packaging, resulting in excess void space that carriers penalized with DIM-weight surcharges.
Founders 3PL mapped every filter SKU to its optimal packaging configuration. Custom carton sizes were selected for the most popular dimensions, and packing protocols were designed to minimize void space without compromising product protection. The result: a 30% reduction in average shipping cost per order.
SKU Complexity Management
Nano Home's catalog includes over 50 unique filter SKUs — combinations of width, height, depth, and filtration rating. Many filters look nearly identical but differ by a single dimension, making visual picking unreliable.
Founders 3PL implemented barcode-validated picking for every filter order. Each SKU is stored in a dedicated bin with clear dimensional labeling, and warehouse staff scan the product barcode at pick to confirm the correct size before packing. This eliminated the size-mismatch errors that generated returns at Nano Home's previous provider.
Subscription Consolidation
Subscription customers often receive multiple filter sizes in a single shipment — a 20x20x1 for the living room and a 16x25x1 for the bedroom, for example. Consolidating these into a single shipment reduces per-order shipping costs but requires the warehouse to hold partial orders until all components are ready.
Founders 3PL's subscription workflow stages multi-filter orders, consolidating all sizes into a single shipment before the customer's delivery date. This consolidation reduces shipping frequency and cost while ensuring customers receive all their filters together on schedule.
Carrier Negotiation for Oversized Parcels
Air filters frequently exceed standard parcel dimensions, triggering oversized package surcharges from most carriers. These surcharges were a significant cost driver for Nano Home, especially on the larger 4-inch-depth filters.
Founders 3PL negotiated carrier rates specifically optimized for Nano Home's shipment profile — focusing on oversized parcel tiers and regional ground services. By matching carriers to shipment characteristics rather than using default rate cards, the total landed shipping cost dropped significantly across all filter sizes.
Our filters are bulky but light — the worst possible combination for shipping costs. Founders 3PL re-engineered our packaging and negotiated carrier rates that actually fit our products. Our shipping costs dropped 30% without changing a single product.
Nano Home Team