Town, who survived their first stint back in the Sky Bet Championship on the final day last season, appeared well-placed for a top-10 finish at the turn of the year, but have fallen away dramatically and only recently saw off the threat of another relegation battle.
Since Mark Robins' side crashed to a 5-1 defeat at Leeds in early February they have won only four of their 17 league games.
"We have to be honest and hold our hands up - we've had a very disappointing end to the season," Hoyle said in a statement released on the club's official website.
"There is no hiding from that fact; we are in a results business.
"Having retained our Championship status, I am looking forward very positively. We all have another year's experience under our belt to learn from.
"We are in a better position going into the closed season than last year in many key areas and an extra year of development will stand us in good stead.
"By learning from the season, building on what we are good at and sorting out and changing what we don't do well, plus carefully targeted recruitment, I'm confident we can push on to have a much-improved season."
Hoyle said season-ticket sales were crucial to the club's progress now that the Financial Fair Play rules were starting to take effect.
"The strapline this season is 'building for the future, on and off the pitch' and I believe we are doing that," he added.
"Since 2009, Huddersfield Town has been on an upwards curve.
"I know there have been difficult spells in those years - none more so than the second half of this season - but equally I believe in what we are doing at the club.
"To keep moving forward, we need you on our side. We've done everything we can to make Season Cards as affordable as possible; hopefully you can take advantage of this during the next week."