This week, 3 Household Durables stocks are improving their overall rating on Portfolio Grader. Each of these rates an “A” (“strong buy”) or “B” overall (“buy”).

The rating of NACCO Industries, Inc. Class A (NC) moves up this week, rising from a B to a A. NACCO Industries, Inc. Class A manufactures and markets forklift trucks and related service parts, as well as mines and markets lignite coal for use as a fuel in power generation by electric utilities. The company also gets A’s in free cash flow. For more information, get Portfolio Grader’s complete analysis of NC stock.

iRobot Corporation (IRBT) boosts its rating from a B to a A this week. IRobot Corporation engages in designing, developing, and marketing robots for the consumer, government, and industrial markets worldwide. The company also gets A’s in earnings surprise. For more information, get Portfolio Grader’s complete analysis of IRBT stock.

This is a strong week for LGI Homes, Inc. (LGIH). The company’s rating climbs to B from the previous week’s C. The company also gets A’s in sales growth, earnings growth, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of LGIH stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.